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class="button action backdrop" aria-label="Collapse sidebar"><span class="button-wrap"></span></button><nav aria-label="Related Topics" class="sidebar-inner"><header class="sidebar-actions"><section class="sidebar-filter-container"><div class="sidebar-filter "><label id="sidebar-filter-label" class="sidebar-filter-label" for="sidebar-filter-input"><span class="icon icon-filter"></span><span class="visually-hidden">Filter sidebar</span></label><input id="sidebar-filter-input" autoComplete="off" class="sidebar-filter-input-field false" type="text" placeholder="Filter" value=""/><button type="button" class="button action has-icon clear-sidebar-filter-button"><span class="button-wrap"><span class="icon icon-cancel "></span><span class="visually-hidden">Clear filter input</span></span></button></div></section></header><div class="sidebar-inner-nav"><div class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In diesem Artikel</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#probieren_sie_es_aus">Probieren Sie es aus</a></li><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#beschreibung">Beschreibung</a></li><li class="document-toc-item "><a class="document-toc-link" href="#beispiele">Beispiele</a></li><li class="document-toc-item "><a class="document-toc-link" href="#spezifikationen">Spezifikationen</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser-kompatibilität">Browser-Kompatibilität</a></li><li class="document-toc-item "><a class="document-toc-link" href="#siehe_auch">Siehe auch</a></li></ul></section></div></div><div class="sidebar-body"> <ol> <li class="section"><a href="/de/docs/Web/JavaScript">JavaScript</a></li> <li class="section">Tutorials</li> <li class="toggle"> <details> <summary>Komplette Anfänger</summary> <ol> <li><a href="/de/docs/Learn/Getting_started_with_the_web/JavaScript_basics">JavaScript-Grundlagen</a></li> <li><a href="/de/docs/Learn/JavaScript/First_steps">Erste Schritte in JavaScript</a></li> <li><a href="/de/docs/Learn/JavaScript/Building_blocks">JavaScript-Bausteine</a></li> <li><a href="/de/docs/Learn/JavaScript/Objects">Einführung in JavaScript-Objekte</a></li> </ol> </details> </li> <li class="toggle"> <details> <summary>JavaScript-Handbuch</summary> <ol> <li><a href="/de/docs/Web/JavaScript/Guide/Introduction">Einführung</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Grammar_and_types">Grammatik und Typen</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Control_flow_and_error_handling">Steuerfluss und Fehlerbehandlung</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Loops_and_iteration">Schleifen und Iteration</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Functions">Funktionen</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Expressions_and_operators">Ausdrücke und Operatoren</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Numbers_and_dates">Zahlen und Daten</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Text_formatting">Textformatierung</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Regular_expressions">Reguläre Ausdrücke</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Indexed_collections">Indexierte Sammlungen</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Keyed_collections">Gekennzeichnete Sammlungen</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Working_with_objects">Arbeiten mit Objekten</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Using_classes">Verwendung von Klassen</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Using_promises">Verwendung von Promises</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Typed_arrays">Typisierte Arrays in JavaScript</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Iterators_and_generators">Iteratoren und Generatoren</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Meta_programming">Metaprogrammierung</a></li> <li><a href="/de/docs/Web/JavaScript/Guide/Modules">JavaScript-Module</a></li> </ol> </details> </li> <li class="toggle"> <details> <summary>Mittelstufe</summary> <ol> <li><a href="/de/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks">Client-seitige JavaScript-Frameworks</a></li> <li><a href="/de/docs/Learn/JavaScript/Client-side_web_APIs">Client-seitige Web-APIs</a></li> <li><a href="/de/docs/Web/JavaScript/Language_overview">Sprachübersicht</a></li> <li><a href="/de/docs/Web/JavaScript/Data_structures">JavaScript-Datenstrukturen</a></li> <li><a href="/de/docs/Web/JavaScript/Equality_comparisons_and_sameness">Gleichheitsvergleiche und Gleichheit</a></li> <li><a href="/de/docs/Web/JavaScript/Enumerability_and_ownership_of_properties">Aufzählbarkeit und Eigentum von Eigenschaften</a></li> <li><a href="/de/docs/Web/JavaScript/Closures">Closures</a></li> </ol> </details> </li> <li class="toggle"> <details> <summary>Fortgeschritten</summary> <ol> <li><a href="/de/docs/Web/JavaScript/Inheritance_and_the_prototype_chain">Vererbung und die Prototypenkette</a></li> <li><a href="/de/docs/Web/JavaScript/Memory_management">Speicherverwaltung</a></li> <li><a href="/de/docs/Web/JavaScript/Event_loop">Konkurrenzmodell und Ereignisschleife</a></li> </ol> </details> </li> <li class="section"><a href="/de/docs/Web/JavaScript/Reference">Referenzen</a></li> <li class="toggle"> <details> <summary>Eingebaute Objekte</summary> <ol><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects">Standard eingebaute Objekte</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/AggregateError">AggregateError</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Array">Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer">ArrayBuffer</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncFunction">AsyncFunction</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncGenerator">AsyncGenerator</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncGeneratorFunction">AsyncGeneratorFunction</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncIterator">AsyncIterator</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Atomics">Atomics</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/BigInt">BigInt</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/BigInt64Array">BigInt64Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/BigUint64Array">BigUint64Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Boolean">Boolean</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/DataView">DataView</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Date">Date</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/decodeURI">decodeURI()</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent">decodeURIComponent()</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/encodeURI">encodeURI()</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent">encodeURIComponent()</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Error">Error</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/escape">escape()</a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/eval">eval()</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/EvalError">EvalError</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/FinalizationRegistry">FinalizationRegistry</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Float16Array">Float16Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Float32Array">Float32Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Float64Array">Float64Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Function">Function</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Generator">Generator</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/GeneratorFunction">GeneratorFunction</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/globalThis">globalThis</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Infinity">Infinity</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Int16Array">Int16Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Int32Array">Int32Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Int8Array">Int8Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/InternalError">InternalError</a><abbr class="icon icon-nonstandard" title="Nicht standardisiert. Überprüfen Sie die Unterstützung in verschiedenen Browsern, bevor Sie es verwenden."> <span class="visually-hidden">Nicht standardisiert</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Intl">Intl</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/isFinite">isFinite()</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/isNaN">isNaN()</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Iterator">Iterator</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/JSON">JSON</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Map">Map</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Math">Math</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/NaN">NaN</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Number">Number</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object">Object</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/parseFloat">parseFloat()</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/parseInt">parseInt()</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy">Proxy</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/RangeError">RangeError</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/ReferenceError">ReferenceError</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect">Reflect</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/RegExp">RegExp</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Set">Set</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer">SharedArrayBuffer</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/String">String</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Symbol">Symbol</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/SyntaxError">SyntaxError</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/TypedArray">TypedArray</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/TypeError">TypeError</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Uint16Array">Uint16Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Uint32Array">Uint32Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array">Uint8Array</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray">Uint8ClampedArray</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/undefined">undefined</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/unescape">unescape()</a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/URIError">URIError</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/WeakMap">WeakMap</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/WeakRef">WeakRef</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/WeakSet">WeakSet</a></li></ol> </details> </li> <li class="toggle"> <details> <summary>Ausdrücke und Operatoren</summary> <ol><li><a href="/de/docs/Web/JavaScript/Reference/Operators">Ausdrücke und Operatoren</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Addition">Addition (+)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Addition_assignment">Addition Assignment (+=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Assignment">Zuweisung (=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/async_function">async function expression</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/async_function*">async function* Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/await">await</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Bitwise_AND">Bitweises UND (&)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Bitwise_AND_assignment">Bitweise UND-Zuweisung (&=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Bitwise_NOT">Bitweise NOT (~)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Bitwise_OR">Bitweises Oder (|)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Bitwise_OR_assignment">Bitweises OR-Zuweisung (|=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Bitwise_XOR">Bitweises XOR (^)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Bitwise_XOR_assignment">Bitweises XOR-Zuweisung (^=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/class">Klassenausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Comma_operator">Komma-Operator (,)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Conditional_operator">Bedingungsoperator (ternärer Operator)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Decrement">Decrement (--)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/delete">delete</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment">Destructuring-Zuweisung</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Division">Division (/)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Division_assignment">Division assignment (/=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Equality">Gleichheit (==)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Exponentiation">Potenzierung (**)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Exponentiation_assignment">Exponentiation-Zuweisung (**=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/function">function expression</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/function*">function* Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Greater_than">Greater than (>)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Greater_than_or_equal">Greater than or equal (>=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Grouping">Gruppierungsoperator ( )</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/import.meta">import.meta</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/import">import()</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/in">in</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Increment">Increment (++)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Inequality">Inequality (!=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/instanceof">instanceof</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Left_shift">Left shift (<<)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Left_shift_assignment">Left shift assignment (<<=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Less_than">Less than (<)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Less_than_or_equal">Less than or equal (<=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Logical_AND">Logisches UND (&&)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Logical_AND_assignment">Logical AND assignment (&&=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Logical_NOT">Logisches NICHT (!)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Logical_OR">Logical OR (||)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Logical_OR_assignment">Logische ODER-Zuweisung (||=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Multiplication">Multiplication (*)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Multiplication_assignment">Multiplikationszuweisung (*=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/new">new</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/new.target">new.target</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/null">null</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_assignment">Nullish coalescing assignment (??=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing">Nullish coalescing-Operator (??)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Object_initializer">Object initializer</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Operator_precedence">Operatorpriorität</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Optional_chaining">Optional Chaining (?.)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Property_accessors">Property accessors</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Remainder">Remainder (%)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Remainder_assignment">Remainder-Zuweisung (%=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Right_shift">Rechtsschiebung (>>)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Right_shift_assignment">Right shift assignment (>>=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Spread_syntax">Spread-Syntax (...)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Strict_equality">Strikte Gleichheit (===)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Strict_inequality">Strikte Ungleichheit (!==)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Subtraction">Subtraction (-)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Subtraction_assignment">Subtraction assignment (-=)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/super">super</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/this">this</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/typeof">typeof</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Unary_negation">Unäre Negation (-)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Unary_plus">Unary plus (+)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Unsigned_right_shift">Unsigned right shift (>>>)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/Unsigned_right_shift_assignment">Unsigned right shift assignment (`>>>=`)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/void">void operator</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/yield">yield</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Operators/yield*">yield*</a></li></ol> </details> </li> <li class="toggle"> <details open=""> <summary>Anweisungen und Deklarationen</summary> <ol><li><a href="/de/docs/Web/JavaScript/Reference/Statements">Statements und Deklarationen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/async_function">async function</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/async_function*">async function*</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/block">Block Statement</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/break">break</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/class">class</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/const">const</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/continue">continue</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/debugger">debugger</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/do...while">do...while</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/Empty">Empty Statement</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/export">export</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/Expression_statement">Expression statement</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/for">for</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/for-await...of">for await...of</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/for...in">for...in</a></li><li><em><a href="/de/docs/Web/JavaScript/Reference/Statements/for...of" aria-current="page">for...of</a></em></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/function">function</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/function*">function*</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/if...else">if...else</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/import">import</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/label">Labelierte Anweisung</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/let">let</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/return">return</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/switch">switch</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/throw">throw</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/try...catch">try...catch</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/var">var</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/while">while</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Statements/with">with</a><abbr class="icon icon-deprecated" title="Veraltet. Nicht für neue Websites verwenden."> <span class="visually-hidden">Veraltet</span> </abbr></li></ol> </details> </li> <li class="toggle"> <details> <summary>Funktionen</summary> <ol><li><a href="/de/docs/Web/JavaScript/Reference/Functions">Functions</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Functions/Arrow_functions">Pfeilfunktionen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Functions/Default_parameters">Default parameters</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Functions/get">get</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Functions/Method_definitions">Methodendefinitionen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Functions/rest_parameters">Rest-Parameter</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Functions/set">set</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Functions/arguments">Das arguments Objekt</a></li></ol> </details> </li> <li class="toggle"> <details> <summary>Klassen</summary> <ol><li><a href="/de/docs/Web/JavaScript/Reference/Classes">Klassen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Classes/constructor">constructor</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Classes/extends">extends</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Classes/Private_properties">Private properties</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Classes/Public_class_fields">Public class fields</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Classes/static">static</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Classes/Static_initialization_blocks">Statische Initialisierungsblöcke</a></li></ol> </details> </li> <li class="toggle"> <details> <summary>Reguläre Ausdrücke</summary> <ol><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions">Regular expressions</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Backreference">Backreference: \1, \2</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Capturing_group">Capturing group: (...)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Character_class_escape">Zeichenklassen-Escape: \d, \D, \w, \W, \s, \S</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Character_class">Zeichenklasse: [...], [^...]</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Character_escape">Zeichen-Escape: \n, \u{...}</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Disjunction">Disjunktion: |</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Input_boundary_assertion">Input-Bereichs-Assertion: ^, $</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Literal_character">Literalzeichen: a, b</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Lookahead_assertion">Lookahead-Assertion: (?=...), (?!...)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Lookbehind_assertion">Lookbehind Assertion: (?<=...), (?<!...)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Modifier">Modifikator: (?ims-ims:...)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Named_backreference">Benannte Rückreferenz: \k<name></a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Named_capturing_group">Named capturing group: (?<name>...)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Non-capturing_group">Nicht erfassende Gruppe: (?:...)</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Quantifier">Quantifier: *, +, ?, {n}, {n,}, {n,m}</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Unicode_character_class_escape">Unicode-Zeichenklassenescapes: \p{...}, \P{...}</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Wildcard">Wildcard: .</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Regular_expressions/Word_boundary_assertion">Wortgrenzen-Assertion: \b, \B</a></li></ol> </details> </li> <li class="toggle"> <details> <summary>Fehler</summary> <ol><li><a href="/de/docs/Web/JavaScript/Reference/Errors">JavaScript-Fehlerreferenz</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Promise_any_all_rejected">AggregateError: Kein Promise in Promise.any wurde aufgelöst</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Property_access_denied">Fehler: Zugriff verweigert auf Eigenschaft "x"</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Too_much_recursion">InternalError: zu viel Rekursion</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Not_a_valid_code_point">RangeError: argument ist kein gültiger Codepunkt</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/BigInt_division_by_zero">RangeError: BigInt-Division durch Null</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/BigInt_negative_exponent">RangeError: BigInt negative exponent</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Form_must_be_one_of">RangeError: form muss einer von 'NFC', 'NFD', 'NFKC' oder 'NFKD' sein</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Invalid_array_length">RangeError: invalid array length</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Invalid_date">RangeError: invalid date</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Precision_range">RangeError: precision liegt außerhalb des zulässigen Bereichs</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_radix">RangeError: radix muss eine ganze Zahl sein</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Resulting_string_too_large">RangeError: repeat count muss kleiner als unendlich sein</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Negative_repetition_count">RangeError: repeat count must be non-negative</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_be_converted_to_BigInt_because_it_isnt_an_integer">RangeError: x kann nicht in BigInt konvertiert werden, da es keine ganze Zahl ist</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Not_defined">ReferenceError: "x" ist nicht definiert</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Undeclared_var">ReferenceError: Zuordnung zu einer nicht deklarierten Variable "x"</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_access_lexical_declaration_before_init">ReferenceError: kann auf lexikalische Deklaration 'X' vor der Initialisierung nicht zugreifen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Deprecated_caller_or_arguments_usage">ReferenceError: veraltete Verwendung von caller oder arguments</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Super_not_called">ReferenceError: 'super' Konstruktor muss vor der Verwendung von 'this' im Konstruktor der abgeleiteten Klasse aufgerufen werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Super_called_twice">ReferenceError: super() zweimal im abgeleiteten Klassenkonstruktor aufgerufen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_strict_arguments_eval">SyntaxError: 'arguments'/'eval' können im Strict-Mode-Code nicht definiert oder zugewiesen werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Deprecated_octal_literal">SyntaxError: "0"-präfixierte Oktalliterale sind veraltet</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Strict_non_simple_params">SyntaxError: "use strict" nicht erlaubt in Funktion mit nicht einfachen Parametern</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Reserved_identifier">SyntaxError: "x" ist ein reservierter Bezeichner</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_backslash_at_end_of_pattern">SyntaxError: \ am Ende des Musters</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Invalid_for-of_initializer">SyntaxError: Eine Deklaration im Kopf einer for-of-Schleife darf keinen Initialisierer haben</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Delete_in_strict_mode">SyntaxError: Die Anwendung des 'delete'-Operators auf einen unqualifizierten Namen ist veraltet</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Arguments_not_allowed">SyntaxError: arguments ist in Feldern nicht gültig</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_await">SyntaxError: await ist nur in async Funktionen, async Generatoren und Modulen gültig</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/await_yield_in_parameter">SyntaxError: await/yield expression kann nicht im Parameter verwendet werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_use_nullish_coalescing_unparenthesized">SyntaxError: `??` kann nicht ohne Klammern innerhalb von `||` und `&&`-Ausdrücken verwendet werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_character_class_escape_in_class_range">SyntaxError: Zeichenklassen-Escape kann nicht im Klassenbereich im regulären Ausdruck verwendet werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_continue">SyntaxError: continue muss innerhalb einer Schleife sein</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_duplicate_capture_group_name">SyntaxError: doppelter Name der Erfassungsgruppe im regulären Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Duplicate_parameter">SyntaxError: doppeltes formales Argument x</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Invalid_for-in_initializer">SyntaxError: Deklarationen im Kopf einer for-in-Schleife dürfen keine Initialisierer enthalten</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Unnamed_function_statement">SyntaxError: Funktionsanweisung erfordert einen Namen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Function_label">SyntaxError: Funktionen können nicht beschriftet werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Either_be_both_static_or_non-static">SyntaxError: Getter und Setter für privaten Namen #x sollten entweder beide statisch oder nicht statisch sein</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Getter_no_arguments">SyntaxError: Getter-Funktionen dürfen keine Argumente haben</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Identifier_after_number">SyntaxError: identifier startet direkt nach einer numerischen Literal</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Illegal_character">SyntaxError: illegales Zeichen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/import_decl_module_top_level">SyntaxError: import-Deklarationen dürfen nur auf der obersten Ebene eines Moduls erscheinen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_incomplete_quantifier">SyntaxError: unvollständiger Quantifizierer im regulären Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Invalid_assignment_left-hand_side">SyntaxError: invalid assignment left-hand side</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Invalid_BigInt_syntax">SyntaxError: Ungültige BigInt-Syntax</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_capture_group_name">SyntaxError: ungültiger Name der Erfassungsgruppe im regulären Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_char_in_class">SyntaxError: ungültiges Zeichen in Klasse in regulärem Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_class_set_operation">SyntaxError: Ungültige Klassenmengenoperation im regulären Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_decimal_escape">SyntaxError: ungültiger Dezimal-Escape in regulärem Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_identity_escape">SyntaxError: ungültige Identitätsflucht in regulärem Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_named_capture_reference">SyntaxError: ungültige benannte Referenz in regulärem Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_property_name">SyntaxError: ungültiger Eigenschaftsname im regulären Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_range_in_character_class">SyntaxError: invalid range in character class</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_group">SyntaxError: invalid regexp group</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_regexp_flag">SyntaxError: invalid regular expression flag "x"</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_unicode_escape">SyntaxError: ungültiger Unicode-Escape in regulärem Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/JSON_bad_parse">SyntaxError: JSON.parse: Fehlerhaftes Parsing</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Label_not_found">SyntaxError: label not found</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Missing_colon_after_property_id">SyntaxError: missing : after property id</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Missing_parenthesis_after_argument_list">SyntaxError: missing ) after argument list</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Missing_parenthesis_after_condition">SyntaxError: missing ) after condition</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Missing_bracket_after_list">SyntaxError: missing ] after element list</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Missing_curly_after_function_body">SyntaxError: fehlende } nach Funktionskörper</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Missing_curly_after_property_list">SyntaxError: missing } after property list</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Missing_initializer_in_const">SyntaxError: missing = in const declaration</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Missing_formal_parameter">SyntaxError: missing formal parameter</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Missing_name_after_dot_operator">SyntaxError: missing name after . operator</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/No_variable_name">SyntaxError: missing variable name</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_negated_char_class_with_strings">SyntaxError: Negierte Zeichenklasse mit Strings im regulären Ausdruck</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_new_optional">SyntaxError: new-Schlüsselwort kann nicht mit einer Optionalen Kette verwendet werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_nothing_to_repeat">SyntaxError: nothing to repeat</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_numbers_out_of_order_in_quantifier">SyntaxError: numbers out of order in {} quantifier.</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Deprecated_octal_escape_sequence">SyntaxError: Oktale Escape-Sequenzen können nicht in nicht-getaggten Vorlagenliteralen oder im Strict Mode-Code verwendet werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Parameter_after_rest_parameter">SyntaxError: parameter nach Rest-Parameter</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_delete_private_fields">SyntaxError: private fields können nicht gelöscht werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Duplicate_proto">SyntaxError: Eigenschaftenname __proto__ erscheint mehr als einmal im Objektliteral</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Regex_raw_bracket">SyntaxError: Raw-Klammern sind im regulären Ausdruck mit Unicode-Flag nicht erlaubt</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Redeclared_parameter">SyntaxError: redeclaration of formal parameter "x"</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Undeclared_private_field_or_method">SyntaxError: Verweis auf nicht deklariertes privates Feld oder Methode #x</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Rest_with_default">SyntaxError: Restparameter darf keinen Standardwert haben</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_return">SyntaxError: return not in function</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Setter_one_argument">SyntaxError: Setter-Funktionen müssen ein Argument haben</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/String_literal_EOL">SyntaxError: string literal enthält einen nicht-escaped Zeilenumbruch</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_super_call">SyntaxError: super() ist nur in Konstruktoren abgeleiteter Klassen gültig</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_optional_template">SyntaxError: getaggtes Template kann nicht mit optionaler Verkettung verwendet werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Hash_outside_class">SyntaxError: Unerwartetes '#' außerhalb des Klassenkörpers verwendet</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Unexpected_token">SyntaxError: Unerwartetes Token</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_break">SyntaxError: unlabeled break muss innerhalb einer Schleife oder eines Switch sein</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Unparenthesized_unary_expr_lhs_exponentiation">SyntaxError: unverklammerter unärer Ausdruck kann nicht auf der linken Seite von '**' erscheinen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Bad_super_prop">SyntaxError: Verwendung von Super-Eigenschaften/-mitgliedern ist nur innerhalb von Methoden oder eval-Code innerhalb von Methoden gültig</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Deprecated_source_map_pragma">SyntaxError: Die Verwendung von //@ zur Angabe von sourceURL-Pragmas ist veraltet. Verwenden Sie stattdessen //#</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/is_not_iterable">TypeError: 'x' ist nicht iterierbar</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Unexpected_type">TypeError: "x" ist (nicht) "y"</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Not_a_constructor">TypeError: "x" ist kein Konstruktor</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Not_a_function">TypeError: "x" ist keine Funktion</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/No_non-null_object">TypeError: "x" ist kein nicht-null-Objekt</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Read-only">TypeError: "x" ist schreibgeschützt</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/BigInt_not_serializable">TypeError: BigInt-Wert kann nicht in JSON serialisiert werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Builtin_ctor_no_new">TypeError: Der Aufruf eines eingebauten X-Konstruktors ohne new ist verboten</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Get_set_missing_private">TypeError: kann nicht auf privates Feld oder Methode zugreifen/setzen: Objekt ist nicht die richtige Klasse</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_assign_to_property">TypeError: kann Eigenschaft „x“ auf „y“ nicht zuweisen: kein Objekt</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_convert_BigInt_to_number">TypeError: can't convert BigInt to number</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_convert_x_to_BigInt">TypeError: kann x nicht in BigInt konvertieren</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_define_property_object_not_extensible">TypeError: kann Eigenschaft "x" nicht definieren: "obj" ist nicht erweiterbar</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Non_configurable_array_element">TypeError: can't delete non-configurable array element</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_redefine_property">TypeError: kann nicht konfigurierbare Eigenschaft "x" neu definieren</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_set_prototype">TypeError: kann das Prototyp dieses Objekts nicht festlegen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cyclic_prototype">TypeError: can't set prototype: it would cause a prototype chain cycle</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/in_operator_no_object">TypeError: kann den 'in'-Operator nicht verwenden, um nach 'x' in 'y' zu suchen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Class_ctor_no_new">TypeError: Klassenkonstruktoren müssen mit 'new' aufgerufen werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cyclic_object_value">TypeError: cyclic object value</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Invalid_derived_return">TypeError: abgeleiteter Klassenkonstruktor hat einen ungültigen Wert x zurückgegeben</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Private_setter_only">TypeError: getting private setter-only property</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Private_double_initialization">TypeError: Initialisierung eines Objekts zweimal ist ein Fehler bei privaten Feldern/Methoden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/invalid_right_hand_side_instanceof_operand">TypeError: ungültiger 'instanceof'-Operand 'x'</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Array_sort_argument">TypeError: invalides Array.prototype.sort Argument</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Invalid_const_assignment">TypeError: ungültige Zuweisung zu const "x"</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Constructor_cant_be_used_directly">TypeError: Iterator/AsyncIterator-Konstruktor kann nicht direkt verwendet werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Requires_global_RegExp">TypeError: matchAll/replaceAll muss mit einem globalen RegExp aufgerufen werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/More_arguments_needed">TypeError: Mehr Argumente benötigt</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/No_properties">TypeError: null/undefined hat keine Eigenschaften</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Cant_delete">TypeError: Eigenschaft "x" ist nicht konfigurierbar und kann nicht gelöscht werden</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Reduce_of_empty_array_with_no_initial_value">TypeError: Reduce eines leeren Arrays ohne initialen Wert</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Getter_only">TypeError: Einstellung der nur-Getter-Eigenschaft "x"</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Key_not_weakly_held">TypeError: WeakSet-Schlüssel/WeakMap-Wert 'x' muss ein Objekt oder ein nicht registriertes Symbol sein</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Called_on_incompatible_type">TypeError: X.prototype.y auf inkompatiblen Typ aufgerufen</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Malformed_URI">URIError: malformed URI sequence</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Already_has_pragma">Warnung: -file- wird ein //# sourceMappingURL zugewiesen, hat aber bereits eines</a></li><li><a href="/de/docs/Web/JavaScript/Reference/Errors/Stmt_after_return">Warnung: unerreichbarer Code nach return-Anweisung</a></li></ol> </details> </li> <li class="toggle"> <details> <summary>Sonstiges</summary> <ol> <li><a href="/de/docs/Web/JavaScript/JavaScript_technologies_overview">JavaScript-Technologie (Übersicht)</a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Lexical_grammar">Lexikalische Grammatik</a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Iteration_protocols">Iterationsprotokolle</a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Strict_mode">Strenger Modus</a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Template_literals">Vorlagenliterale</a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Trailing_commas">Abschließende Kommas</a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Deprecated_and_obsolete_features">Veraltete Funktionen</a></li> </ol> </details> </li> </ol> </div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In diesem Artikel</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#probieren_sie_es_aus">Probieren Sie es aus</a></li><li class="document-toc-item "><a class="document-toc-link" href="#syntax">Syntax</a></li><li class="document-toc-item "><a class="document-toc-link" href="#beschreibung">Beschreibung</a></li><li class="document-toc-item "><a class="document-toc-link" href="#beispiele">Beispiele</a></li><li class="document-toc-item "><a class="document-toc-link" href="#spezifikationen">Spezifikationen</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser-kompatibilität">Browser-Kompatibilität</a></li><li class="document-toc-item "><a class="document-toc-link" href="#siehe_auch">Siehe auch</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="de"><header><h1>for...of</h1><details class="baseline-indicator high"><summary><span class="indicator" role="img" aria-label="Baseline Check"></span><h2>Baseline <span class="not-bold">Widely available</span></h2><div class="browsers"><span class="engine" title="Supported in Chrome and Edge"><span class="browser chrome supported" role="img" aria-label="Chrome check"></span><span class="browser edge supported" role="img" aria-label="Edge check"></span></span><span class="engine" title="Supported in Firefox"><span class="browser firefox supported" role="img" aria-label="Firefox check"></span></span><span class="engine" title="Supported in Safari"><span class="browser safari supported" role="img" aria-label="Safari check"></span></span></div><span class="icon icon-chevron "></span></summary><div class="extra"><p>This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.</p><ul><li><a href="/de/docs/Glossary/Baseline/Compatibility" data-glean="baseline_link_learn_more" target="_blank" class="learn-more">Learn more</a></li><li><a href="#browser-kompatibilität" data-glean="baseline_link_bcd_table">See full compatibility</a></li><li><a href="https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fde%2Fdocs%2FWeb%2FJavaScript%2FReference%2FStatements%2Ffor...of&level=high" data-glean="baseline_link_feedback" class="feedback-link" target="_blank" rel="noreferrer">Report feedback</a></li></ul></div></details></header><div class="section-content"><p>Die <strong><code>for...of</code></strong>-Anweisung führt eine Schleife aus, die auf einer Sequenz von Werten arbeitet, die aus einem <a href="/de/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterable_protocol">iterierbaren Objekt</a> stammen. Iterierbare Objekte umfassen Instanzen von integrierten Objekten wie <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Array"><code>Array</code></a>, <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/String"><code>String</code></a>, <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/TypedArray"><code>TypedArray</code></a>, <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Map"><code>Map</code></a>, <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Set"><code>Set</code></a>, <a href="/de/docs/Web/API/NodeList"><code>NodeList</code></a> (und anderen DOM-Sammlungen) sowie das <a href="/de/docs/Web/JavaScript/Reference/Functions/arguments"><code>arguments</code></a>-Objekt, <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Generator">Generatoren</a>, die durch <a href="/de/docs/Web/JavaScript/Reference/Statements/function*">Generatorfunktionen</a> erzeugt werden, und benutzerdefinierte Iterables.</p></div><section aria-labelledby="probieren_sie_es_aus"><h2 id="probieren_sie_es_aus"><a href="#probieren_sie_es_aus">Probieren Sie es aus</a></h2><div class="section-content"><iframe class="interactive is-js-height" height="200" src="https://interactive-examples.mdn.mozilla.net/pages/js/statement-forof.html" title="MDN Web Docs Interactive Example" allow="clipboard-write" loading="lazy"></iframe></div></section><section aria-labelledby="syntax"><h2 id="syntax"><a href="#syntax">Syntax</a></h2><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>for (variable of iterable) statement </code></pre></div> <dl> <dt id="variable"><a href="#variable"><code>variable</code></a></dt> <dd> <p>Erhält bei jeder Iteration einen Wert aus der Sequenz. Kann entweder eine Deklaration mit <a href="/de/docs/Web/JavaScript/Reference/Statements/const"><code>const</code></a>, <a href="/de/docs/Web/JavaScript/Reference/Statements/let"><code>let</code></a> oder <a href="/de/docs/Web/JavaScript/Reference/Statements/var"><code>var</code></a> sein oder ein <a href="/de/docs/Web/JavaScript/Reference/Operators/Assignment">Zuweisungsziel</a> (z.B. eine zuvor deklarierte Variable, eine Objekteigenschaft oder ein <a href="/de/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment">Destrukturierungszuweisungsmuster</a>). Mit <code>var</code> deklarierte Variablen sind nicht lokal zur Schleife, d.h. sie befinden sich im gleichen Gültigkeitsbereich wie die <code>for...of</code>-Schleife.</p> </dd> <dt id="iterable"><a href="#iterable"><code>iterable</code></a></dt> <dd> <p>Ein iterierbares Objekt. Die Quelle der Wertesequenz, auf die die Schleife operiert.</p> </dd> <dt id="statement"><a href="#statement"><code>statement</code></a></dt> <dd> <p>Eine Anweisung, die bei jeder Iteration ausgeführt wird. Kann auf <code>variable</code> verweisen. Sie können eine <a href="/de/docs/Web/JavaScript/Reference/Statements/block">Blockanweisung</a> verwenden, um mehrere Anweisungen auszuführen.</p> </dd> </dl></div></section><section aria-labelledby="beschreibung"><h2 id="beschreibung"><a href="#beschreibung">Beschreibung</a></h2><div class="section-content"><p>Eine <code>for...of</code>-Schleife arbeitet der Reihe nach auf den Werten eines Iterables. Jede Verarbeitung eines Wertes durch die Schleife wird als eine <em>Iteration</em> bezeichnet, und die Schleife <em>iteriert über das Iterable</em>. Jede Iteration führt Anweisungen aus, die auf den aktuellen Wert der Sequenz verweisen können.</p> <p>Wenn eine <code>for...of</code>-Schleife über ein Iterable iteriert, wird zuerst die <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Symbol/iterator"><code>[Symbol.iterator]()</code></a>-Methode des Iterables aufgerufen, die einen <a href="/de/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterator_protocol">Iterator</a> zurückgibt. Anschließend wird wiederholt die <code>next()</code>-Methode des resultierenden Iterators aufgerufen, um die zu <code>variable</code> zuzuweisende Wertesequenz zu erzeugen.</p> <p>Eine <code>for...of</code>-Schleife endet, wenn der Iterator abgeschlossen ist (das <code>next()</code>-Ergebnis ist ein Objekt mit <code>done: true</code>). Wie bei anderen Schleifenbefehlen können Sie <a href="/de/docs/Web/JavaScript/Reference/Statements#control_flow">Steuerflussanweisungen</a> innerhalb von <code>statement</code> verwenden:</p> <ul> <li><a href="/de/docs/Web/JavaScript/Reference/Statements/break"><code>break</code></a> stoppt die Ausführung von <code>statement</code> und geht zur ersten Anweisung nach der Schleife.</li> <li><a href="/de/docs/Web/JavaScript/Reference/Statements/continue"><code>continue</code></a> stoppt die Ausführung von <code>statement</code> und geht zur nächsten Iteration der Schleife über.</li> </ul> <p>Wenn die <code>for...of</code>-Schleife vorzeitig beendet wird (z.B. wird eine <code>break</code>-Anweisung getroffen oder ein Fehler wird ausgelöst), wird die <a href="/de/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterator_protocol"><code>return()</code></a>-Methode des Iterators aufgerufen, um eine Bereinigung durchzuführen.</p> <p>Der <code>variable</code>-Teil von <code>for...of</code> akzeptiert alles, was vor dem <code>=</code>-Operator stehen kann. Sie können <a href="/de/docs/Web/JavaScript/Reference/Statements/const"><code>const</code></a> verwenden, um die Variable zu deklarieren, solange sie nicht im Schleifenkörper neu zugewiesen wird (sie kann sich zwischen den Iterationen ändern, da dies zwei separate Variablen sind). Andernfalls können Sie <a href="/de/docs/Web/JavaScript/Reference/Statements/let"><code>let</code></a> verwenden.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const iterable = [10, 20, 30]; for (let value of iterable) { value += 1; console.log(value); } // 11 // 21 // 31 </code></pre></div> <div class="notecard note"> <p><strong>Hinweis:</strong> Jede Iteration erstellt eine neue Variable. Eine Neuzuordnung der Variable innerhalb des Schleifenkörpers hat keine Auswirkungen auf den ursprünglichen Wert im Iterable (in diesem Fall ein Array).</p> </div> <p>Sie können <a href="/de/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment">Destrukturierung</a> verwenden, um mehrere lokale Variablen zuzuweisen, oder einen Property-Accessor wie <code>for (x.y of iterable)</code> verwenden, um den Wert einer Objekteigenschaft zuzuweisen.</p> <p>Eine spezielle Regel verbietet jedoch die Verwendung von <code>async</code> als Variablennamen. Das ist ungültige Syntax:</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js example-bad notranslate"><code>let async; for (async of [1, 2, 3]); // SyntaxError: The left-hand side of a for-of loop may not be 'async'. </code></pre></div> <p>Dies soll Syntaxzweideutigkeiten mit dem gültigen Code <code>for (async of => {};;)</code> vermeiden, was eine <a href="/de/docs/Web/JavaScript/Reference/Statements/for"><code>for</code></a>-Schleife ist.</p></div></section><section aria-labelledby="beispiele"><h2 id="beispiele"><a href="#beispiele">Beispiele</a></h2><div class="section-content"></div></section><section aria-labelledby="iterieren_über_ein_array"><h3 id="iterieren_über_ein_array"><a href="#iterieren_über_ein_array">Iterieren über ein Array</a></h3><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const iterable = [10, 20, 30]; for (const value of iterable) { console.log(value); } // 10 // 20 // 30 </code></pre></div></div></section><section aria-labelledby="iterieren_über_einen_string"><h3 id="iterieren_über_einen_string"><a href="#iterieren_über_einen_string">Iterieren über einen String</a></h3><div class="section-content"><p>Strings werden <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/String/Symbol.iterator">nach Unicode-Codepunkten iteriert</a>.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const iterable = "boo"; for (const value of iterable) { console.log(value); } // "b" // "o" // "o" </code></pre></div></div></section><section aria-labelledby="iterieren_über_ein_typedarray"><h3 id="iterieren_über_ein_typedarray"><a href="#iterieren_über_ein_typedarray">Iterieren über ein TypedArray</a></h3><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const iterable = new Uint8Array([0x00, 0xff]); for (const value of iterable) { console.log(value); } // 0 // 255 </code></pre></div></div></section><section aria-labelledby="iterieren_über_eine_map"><h3 id="iterieren_über_eine_map"><a href="#iterieren_über_eine_map">Iterieren über eine Map</a></h3><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const iterable = new Map([ ["a", 1], ["b", 2], ["c", 3], ]); for (const entry of iterable) { console.log(entry); } // ['a', 1] // ['b', 2] // ['c', 3] for (const [key, value] of iterable) { console.log(value); } // 1 // 2 // 3 </code></pre></div></div></section><section aria-labelledby="iterieren_über_ein_set"><h3 id="iterieren_über_ein_set"><a href="#iterieren_über_ein_set">Iterieren über ein Set</a></h3><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const iterable = new Set([1, 1, 2, 2, 3, 3]); for (const value of iterable) { console.log(value); } // 1 // 2 // 3 </code></pre></div></div></section><section aria-labelledby="iterieren_über_das_arguments-objekt"><h3 id="iterieren_über_das_arguments-objekt"><a href="#iterieren_über_das_arguments-objekt">Iterieren über das <code>arguments</code>-Objekt</a></h3><div class="section-content"><p>Sie können über das <a href="/de/docs/Web/JavaScript/Reference/Functions/arguments"><code>arguments</code></a>-Objekt iterieren, um alle in eine Funktion übergebenen Parameter zu untersuchen.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>function foo() { for (const value of arguments) { console.log(value); } } foo(1, 2, 3); // 1 // 2 // 3 </code></pre></div></div></section><section aria-labelledby="iterieren_über_eine_nodelist"><h3 id="iterieren_über_eine_nodelist"><a href="#iterieren_über_eine_nodelist">Iterieren über eine NodeList</a></h3><div class="section-content"><p>Das folgende Beispiel fügt Absätzen, die direkte Nachkommen des <a href="/de/docs/Web/HTML/Element/article"><code><article></code></a>-Elements sind, durch Iteration über eine <a href="/de/docs/Web/API/NodeList"><code>NodeList</code></a> DOM-Sammlung eine <code>read</code>-Klasse hinzu.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const articleParagraphs = document.querySelectorAll("article > p"); for (const paragraph of articleParagraphs) { paragraph.classList.add("read"); } </code></pre></div></div></section><section aria-labelledby="iterieren_über_ein_benutzerdefiniertes_iterable"><h3 id="iterieren_über_ein_benutzerdefiniertes_iterable"><a href="#iterieren_über_ein_benutzerdefiniertes_iterable">Iterieren über ein benutzerdefiniertes Iterable</a></h3><div class="section-content"><p>Iterieren über ein Objekt mit einer <code>[Symbol.iterator]()</code>-Methode, die einen benutzerdefinierten Iterator zurückgibt:</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const iterable = { [Symbol.iterator]() { let i = 1; return { next() { if (i <= 3) { return { value: i++, done: false }; } return { value: undefined, done: true }; }, }; }, }; for (const value of iterable) { console.log(value); } // 1 // 2 // 3 </code></pre></div> <p>Iterieren über ein Objekt mit einer <code>[Symbol.iterator]()</code> Generator-Methode:</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const iterable = { *[Symbol.iterator]() { yield 1; yield 2; yield 3; }, }; for (const value of iterable) { console.log(value); } // 1 // 2 // 3 </code></pre></div> <p><em>Iterierbare Iteratoren</em> (Iteratoren mit einer <code>[Symbol.iterator]()</code>-Methode, die <code>this</code> zurückgibt) sind eine ziemlich gebräuchliche Technik, um Iteratoren in Syntaxen nutzbar zu machen, die Iterable erwarten, wie <code>for...of</code>.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>let i = 1; const iterator = { next() { if (i <= 3) { return { value: i++, done: false }; } return { value: undefined, done: true }; }, [Symbol.iterator]() { return this; }, }; for (const value of iterator) { console.log(value); } // 1 // 2 // 3 </code></pre></div></div></section><section aria-labelledby="iterieren_über_einen_generator"><h3 id="iterieren_über_einen_generator"><a href="#iterieren_über_einen_generator">Iterieren über einen Generator</a></h3><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>function* source() { yield 1; yield 2; yield 3; } const generator = source(); for (const value of generator) { console.log(value); } // 1 // 2 // 3 </code></pre></div></div></section><section aria-labelledby="vorzeitiges_beenden"><h3 id="vorzeitiges_beenden"><a href="#vorzeitiges_beenden">Vorzeitiges Beenden</a></h3><div class="section-content"><p>Die Ausführung der <code>break</code>-Anweisung in der ersten Schleife führt dazu, dass sie vorzeitig beendet wird. Der Iterator ist noch nicht fertig, daher wird die zweite Schleife von dort fortgesetzt, wo die erste aufgehört hat.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const source = [1, 2, 3]; const iterator = source[Symbol.iterator](); for (const value of iterator) { console.log(value); if (value === 1) { break; } console.log("This string will not be logged."); } // 1 // Another loop using the same iterator // picks up where the last loop left off. for (const value of iterator) { console.log(value); } // 2 // 3 // The iterator is used up. // This loop will execute no iterations. for (const value of iterator) { console.log(value); } // [No output] </code></pre></div> <p>Generatoren implementieren die <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Generator/return"><code>return()</code></a>-Methode, die dafür sorgt, dass die Generatorfunktion vorzeitig zurückkehrt, wenn die Schleife beendet wird. Dadurch sind Generatoren nicht zwischen Schleifen wiederverwendbar.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js example-bad notranslate"><code>function* source() { yield 1; yield 2; yield 3; } const generator = source(); for (const value of generator) { console.log(value); if (value === 1) { break; } console.log("This string will not be logged."); } // 1 // The generator is used up. // This loop will execute no iterations. for (const value of generator) { console.log(value); } // [No output] </code></pre></div></div></section><section aria-labelledby="unterschied_zwischen_for...of_und_for...in"><h3 id="unterschied_zwischen_for...of_und_for...in"><a href="#unterschied_zwischen_for...of_und_for...in">Unterschied zwischen for...of und for...in</a></h3><div class="section-content"><p>Sowohl <code>for...in</code> als auch <code>for...of</code>-Anweisungen iterieren über etwas. Der Hauptunterschied zwischen ihnen besteht darin, worüber sie iterieren.</p> <p>Die <a href="/de/docs/Web/JavaScript/Reference/Statements/for...in"><code>for...in</code></a>-Anweisung iteriert über die <a href="/de/docs/Web/JavaScript/Enumerability_and_ownership_of_properties">enumerierbaren String-Eigenschaften</a> eines Objekts, während die <code>for...of</code>-Anweisung über Werte iteriert, die das <a href="/de/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterable_protocol">iterierbare Objekt</a> zum Iterieren definiert hat.</p> <p>Das folgende Beispiel zeigt den Unterschied zwischen einer <code>for...of</code>-Schleife und einer <code>for...in</code>-Schleife, wenn sie mit einem <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Array"><code>Array</code></a> verwendet werden.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>Object.prototype.objCustom = function () {}; Array.prototype.arrCustom = function () {}; const iterable = [3, 5, 7]; iterable.foo = "hello"; for (const i in iterable) { console.log(i); } // "0", "1", "2", "foo", "arrCustom", "objCustom" for (const i in iterable) { if (Object.hasOwn(iterable, i)) { console.log(i); } } // "0" "1" "2" "foo" for (const i of iterable) { console.log(i); } // 3 5 7 </code></pre></div> <p>Das Objekt <code>iterable</code> erbt die Eigenschaften <code>objCustom</code> und <code>arrCustom</code>, weil es sowohl <code>Object.prototype</code> als auch <code>Array.prototype</code> in seiner <a href="/de/docs/Web/JavaScript/Inheritance_and_the_prototype_chain">Prototypkette</a> hat.</p> <p>Die <code>for...in</code>-Schleife protokolliert nur die <a href="/de/docs/Web/JavaScript/Enumerability_and_ownership_of_properties">enumerierbaren Eigenschaften</a> des Objekts <code>iterable</code>. Sie protokolliert keine Array-<em>Elemente</em> <code>3</code>, <code>5</code>, <code>7</code> oder <code>"hello"</code>, weil diese keine <em>Eigenschaften</em> sind - sie sind <em>Werte</em>. Sie protokolliert Array-<em>Indizes</em> sowie <code>arrCustom</code> und <code>objCustom</code>, die tatsächliche Eigenschaften sind. Wenn Sie nicht sicher sind, warum diese Eigenschaften iteriert werden, gibt es eine detailliertere Erklärung dazu, wie <a href="/de/docs/Web/JavaScript/Reference/Statements/for...in#array_iteration_and_for...in">Array-Iteration und <code>for...in</code></a> funktionieren.</p> <p>Die zweite Schleife ist der ersten ähnlich, verwendet jedoch <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn"><code>Object.hasOwn()</code></a>, um zu überprüfen, ob die gefundene enumerierbare Eigenschaft die eigene des Objekts ist, also nicht geerbt. Wenn dies der Fall ist, wird die Eigenschaft protokolliert. Die Eigenschaften <code>0</code>, <code>1</code>, <code>2</code> und <code>foo</code> werden protokolliert, weil sie eigene Eigenschaften sind. Die Eigenschaften <code>arrCustom</code> und <code>objCustom</code> werden nicht protokolliert, weil sie geerbt sind.</p> <p>Die <code>for...of</code>-Schleife iteriert über und protokolliert <em>Werte</em>, die <code>iterable</code> als Array (das <a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Array/Symbol.iterator">iterierbar</a> ist) zum Iterieren definiert hat. Die <em>Elemente</em> <code>3</code>, <code>5</code>, <code>7</code> des Objekts werden angezeigt, aber keine der <em>Eigenschaften</em> des Objekts werden protokolliert.</p></div></section><h2 id="spezifikationen"><a href="#spezifikationen">Spezifikationen</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements">ECMAScript Language Specification <br/><small># sec-for-in-and-for-of-statements</small></a></td></tr></tbody></table><h2 id="browser-kompatibilität"><a href="#browser-kompatibilität">Browser-Kompatibilität</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. Enable JavaScript to view data.</noscript></p><section aria-labelledby="siehe_auch"><h2 id="siehe_auch"><a href="#siehe_auch">Siehe auch</a></h2><div class="section-content"><ul> <li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach"><code>Array.prototype.forEach()</code></a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Map/forEach"><code>Map.prototype.forEach()</code></a></li> <li><a href="/de/docs/Web/JavaScript/Reference/Global_Objects/Object/entries"><code>Object.entries()</code></a></li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 11.411s17.656 14.28 23.476 23.86c5.819 9.579 9.269 20.318 10.083 31.385a69.85 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href=\"/de/docs/Learn/Getting_started_with_the_web/JavaScript_basics\">JavaScript-Grundlagen</a></li>\n <li><a href=\"/de/docs/Learn/JavaScript/First_steps\">Erste Schritte in JavaScript</a></li>\n <li><a href=\"/de/docs/Learn/JavaScript/Building_blocks\">JavaScript-Bausteine</a></li>\n <li><a href=\"/de/docs/Learn/JavaScript/Objects\">Einführung in JavaScript-Objekte</a></li>\n </ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>JavaScript-Handbuch</summary>\n <ol>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Introduction\">Einführung</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Grammar_and_types\">Grammatik und Typen</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Control_flow_and_error_handling\">Steuerfluss und Fehlerbehandlung</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Loops_and_iteration\">Schleifen und Iteration</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Functions\">Funktionen</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Expressions_and_operators\">Ausdrücke und Operatoren</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Numbers_and_dates\">Zahlen und Daten</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Text_formatting\">Textformatierung</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Regular_expressions\">Reguläre Ausdrücke</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Indexed_collections\">Indexierte Sammlungen</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Keyed_collections\">Gekennzeichnete Sammlungen</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Working_with_objects\">Arbeiten mit Objekten</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Using_classes\">Verwendung von Klassen</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Using_promises\">Verwendung von Promises</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Typed_arrays\">Typisierte Arrays in JavaScript</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Iterators_and_generators\">Iteratoren und Generatoren</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Meta_programming\">Metaprogrammierung</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Guide/Modules\">JavaScript-Module</a></li>\n </ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>Mittelstufe</summary>\n <ol>\n <li><a href=\"/de/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks\">Client-seitige JavaScript-Frameworks</a></li>\n <li><a href=\"/de/docs/Learn/JavaScript/Client-side_web_APIs\">Client-seitige Web-APIs</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Language_overview\">Sprachübersicht</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Data_structures\">JavaScript-Datenstrukturen</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Equality_comparisons_and_sameness\">Gleichheitsvergleiche und Gleichheit</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Enumerability_and_ownership_of_properties\">Aufzählbarkeit und Eigentum von Eigenschaften</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Closures\">Closures</a></li>\n </ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>Fortgeschritten</summary>\n <ol>\n <li><a href=\"/de/docs/Web/JavaScript/Inheritance_and_the_prototype_chain\">Vererbung und die Prototypenkette</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Memory_management\">Speicherverwaltung</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Event_loop\">Konkurrenzmodell und Ereignisschleife</a></li>\n </ol>\n </details>\n </li>\n <li class=\"section\"><a href=\"/de/docs/Web/JavaScript/Reference\">Referenzen</a></li>\n <li class=\"toggle\">\n <details>\n <summary>Eingebaute Objekte</summary>\n <ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects\">Standard eingebaute Objekte</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/AggregateError\">AggregateError</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Array\">Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer\">ArrayBuffer</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncFunction\">AsyncFunction</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncGenerator\">AsyncGenerator</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncGeneratorFunction\">AsyncGeneratorFunction</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/AsyncIterator\">AsyncIterator</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Atomics\">Atomics</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/BigInt\">BigInt</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/BigInt64Array\">BigInt64Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/BigUint64Array\">BigUint64Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Boolean\">Boolean</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/DataView\">DataView</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Date\">Date</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/decodeURI\">decodeURI()</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent\">decodeURIComponent()</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/encodeURI\">encodeURI()</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent\">encodeURIComponent()</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Error\">Error</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/escape\">escape()</a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/eval\">eval()</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/EvalError\">EvalError</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/FinalizationRegistry\">FinalizationRegistry</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Float16Array\">Float16Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Float32Array\">Float32Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Float64Array\">Float64Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Function\">Function</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Generator\">Generator</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/GeneratorFunction\">GeneratorFunction</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/globalThis\">globalThis</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Infinity\">Infinity</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Int16Array\">Int16Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Int32Array\">Int32Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Int8Array\">Int8Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/InternalError\">InternalError</a><abbr class=\"icon icon-nonstandard\" title=\"Nicht standardisiert. Überprüfen Sie die Unterstützung in verschiedenen Browsern, bevor Sie es verwenden.\">\n <span class=\"visually-hidden\">Nicht standardisiert</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Intl\">Intl</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/isFinite\">isFinite()</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/isNaN\">isNaN()</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Iterator\">Iterator</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/JSON\">JSON</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Map\">Map</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Math\">Math</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/NaN\">NaN</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Number\">Number</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object\">Object</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/parseFloat\">parseFloat()</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/parseInt\">parseInt()</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Promise\">Promise</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Proxy\">Proxy</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/RangeError\">RangeError</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/ReferenceError\">ReferenceError</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Reflect\">Reflect</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/RegExp\">RegExp</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Set\">Set</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer\">SharedArrayBuffer</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/String\">String</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Symbol\">Symbol</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/SyntaxError\">SyntaxError</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/TypedArray\">TypedArray</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/TypeError\">TypeError</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Uint16Array\">Uint16Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Uint32Array\">Uint32Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array\">Uint8Array</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray\">Uint8ClampedArray</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/undefined\">undefined</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/unescape\">unescape()</a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/URIError\">URIError</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/WeakMap\">WeakMap</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/WeakRef\">WeakRef</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/WeakSet\">WeakSet</a></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>Ausdrücke und Operatoren</summary>\n <ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators\">Ausdrücke und Operatoren</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Addition\">Addition (+)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Addition_assignment\">Addition Assignment (+=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Assignment\">Zuweisung (=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/async_function\">async function expression</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/async_function*\">async function* Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/await\">await</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Bitwise_AND\">Bitweises UND (&)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Bitwise_AND_assignment\">Bitweise UND-Zuweisung (&=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Bitwise_NOT\">Bitweise NOT (~)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Bitwise_OR\">Bitweises Oder (|)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Bitwise_OR_assignment\">Bitweises OR-Zuweisung (|=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Bitwise_XOR\">Bitweises XOR (^)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Bitwise_XOR_assignment\">Bitweises XOR-Zuweisung (^=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/class\">Klassenausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Comma_operator\">Komma-Operator (,)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Conditional_operator\">Bedingungsoperator (ternärer Operator)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Decrement\">Decrement (--)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/delete\">delete</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment\">Destructuring-Zuweisung</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Division\">Division (/)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Division_assignment\">Division assignment (/=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Equality\">Gleichheit (==)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Exponentiation\">Potenzierung (**)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Exponentiation_assignment\">Exponentiation-Zuweisung (**=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/function\">function expression</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/function*\">function* Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Greater_than\">Greater than (>)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Greater_than_or_equal\">Greater than or equal (>=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Grouping\">Gruppierungsoperator ( )</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/import.meta\">import.meta</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/import\">import()</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/in\">in</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Increment\">Increment (++)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Inequality\">Inequality (!=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/instanceof\">instanceof</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Left_shift\">Left shift (<<)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Left_shift_assignment\">Left shift assignment (<<=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Less_than\">Less than (<)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Less_than_or_equal\">Less than or equal (<=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Logical_AND\">Logisches UND (&&)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Logical_AND_assignment\">Logical AND assignment (&&=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Logical_NOT\">Logisches NICHT (!)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Logical_OR\">Logical OR (||)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Logical_OR_assignment\">Logische ODER-Zuweisung (||=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Multiplication\">Multiplication (*)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Multiplication_assignment\">Multiplikationszuweisung (*=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/new\">new</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/new.target\">new.target</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/null\">null</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_assignment\">Nullish coalescing assignment (??=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing\">Nullish coalescing-Operator (??)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Object_initializer\">Object initializer</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Operator_precedence\">Operatorpriorität</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Optional_chaining\">Optional Chaining (?.)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Property_accessors\">Property accessors</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Remainder\">Remainder (%)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Remainder_assignment\">Remainder-Zuweisung (%=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Right_shift\">Rechtsschiebung (>>)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Right_shift_assignment\">Right shift assignment (>>=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Spread_syntax\">Spread-Syntax (...)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Strict_equality\">Strikte Gleichheit (===)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Strict_inequality\">Strikte Ungleichheit (!==)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Subtraction\">Subtraction (-)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Subtraction_assignment\">Subtraction assignment (-=)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/super\">super</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/this\">this</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/typeof\">typeof</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Unary_negation\">Unäre Negation (-)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Unary_plus\">Unary plus (+)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Unsigned_right_shift\">Unsigned right shift (>>>)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/Unsigned_right_shift_assignment\">Unsigned right shift assignment (`>>>=`)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/void\">void operator</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/yield\">yield</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Operators/yield*\">yield*</a></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details open=\"\">\n <summary>Anweisungen und Deklarationen</summary>\n <ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements\">Statements und Deklarationen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/async_function\">async function</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/async_function*\">async function*</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/block\">Block Statement</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/break\">break</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/class\">class</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/const\">const</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/continue\">continue</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/debugger\">debugger</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/do...while\">do...while</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/Empty\">Empty Statement</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/export\">export</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/Expression_statement\">Expression statement</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/for\">for</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/for-await...of\">for await...of</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/for...in\">for...in</a></li><li><em><a href=\"/de/docs/Web/JavaScript/Reference/Statements/for...of\" aria-current=\"page\">for...of</a></em></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/function\">function</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/function*\">function*</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/if...else\">if...else</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/import\">import</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/label\">Labelierte Anweisung</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/let\">let</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/return\">return</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/switch\">switch</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/throw\">throw</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/try...catch\">try...catch</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/var\">var</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/while\">while</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/with\">with</a><abbr class=\"icon icon-deprecated\" title=\"Veraltet. Nicht für neue Websites verwenden.\">\n <span class=\"visually-hidden\">Veraltet</span>\n</abbr></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>Funktionen</summary>\n <ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Functions\">Functions</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Functions/Arrow_functions\">Pfeilfunktionen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Functions/Default_parameters\">Default parameters</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Functions/get\">get</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Functions/Method_definitions\">Methodendefinitionen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Functions/rest_parameters\">Rest-Parameter</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Functions/set\">set</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Functions/arguments\">Das arguments Objekt</a></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>Klassen</summary>\n <ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Classes\">Klassen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Classes/constructor\">constructor</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Classes/extends\">extends</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Classes/Private_properties\">Private properties</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Classes/Public_class_fields\">Public class fields</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Classes/static\">static</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Classes/Static_initialization_blocks\">Statische Initialisierungsblöcke</a></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>Reguläre Ausdrücke</summary>\n <ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions\">Regular expressions</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Backreference\">Backreference: \\1, \\2</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Capturing_group\">Capturing group: (...)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Character_class_escape\">Zeichenklassen-Escape: \\d, \\D, \\w, \\W, \\s, \\S</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Character_class\">Zeichenklasse: [...], [^...]</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Character_escape\">Zeichen-Escape: \\n, \\u{...}</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Disjunction\">Disjunktion: |</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Input_boundary_assertion\">Input-Bereichs-Assertion: ^, $</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Literal_character\">Literalzeichen: a, b</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Lookahead_assertion\">Lookahead-Assertion: (?=...), (?!...)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Lookbehind_assertion\">Lookbehind Assertion: (?<=...), (?<!...)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Modifier\">Modifikator: (?ims-ims:...)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Named_backreference\">Benannte Rückreferenz: \\k<name></a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Named_capturing_group\">Named capturing group: (?<name>...)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Non-capturing_group\">Nicht erfassende Gruppe: (?:...)</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Quantifier\">Quantifier: *, +, ?, {n}, {n,}, {n,m}</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Unicode_character_class_escape\">Unicode-Zeichenklassenescapes: \\p{...}, \\P{...}</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Wildcard\">Wildcard: .</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Regular_expressions/Word_boundary_assertion\">Wortgrenzen-Assertion: \\b, \\B</a></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>Fehler</summary>\n <ol><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors\">JavaScript-Fehlerreferenz</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Promise_any_all_rejected\">AggregateError: Kein Promise in Promise.any wurde aufgelöst</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Property_access_denied\">Fehler: Zugriff verweigert auf Eigenschaft \"x\"</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Too_much_recursion\">InternalError: zu viel Rekursion</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Not_a_valid_code_point\">RangeError: argument ist kein gültiger Codepunkt</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/BigInt_division_by_zero\">RangeError: BigInt-Division durch Null</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/BigInt_negative_exponent\">RangeError: BigInt negative exponent</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Form_must_be_one_of\">RangeError: form muss einer von 'NFC', 'NFD', 'NFKC' oder 'NFKD' sein</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Invalid_array_length\">RangeError: invalid array length</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Invalid_date\">RangeError: invalid date</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Precision_range\">RangeError: precision liegt außerhalb des zulässigen Bereichs</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_radix\">RangeError: radix muss eine ganze Zahl sein</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Resulting_string_too_large\">RangeError: repeat count muss kleiner als unendlich sein</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Negative_repetition_count\">RangeError: repeat count must be non-negative</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_be_converted_to_BigInt_because_it_isnt_an_integer\">RangeError: x kann nicht in BigInt konvertiert werden, da es keine ganze Zahl ist</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Not_defined\">ReferenceError: \"x\" ist nicht definiert</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Undeclared_var\">ReferenceError: Zuordnung zu einer nicht deklarierten Variable \"x\"</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_access_lexical_declaration_before_init\">ReferenceError: kann auf lexikalische Deklaration 'X' vor der Initialisierung nicht zugreifen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Deprecated_caller_or_arguments_usage\">ReferenceError: veraltete Verwendung von caller oder arguments</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Super_not_called\">ReferenceError: 'super' Konstruktor muss vor der Verwendung von 'this' im Konstruktor der abgeleiteten Klasse aufgerufen werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Super_called_twice\">ReferenceError: super() zweimal im abgeleiteten Klassenkonstruktor aufgerufen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_strict_arguments_eval\">SyntaxError: 'arguments'/'eval' können im Strict-Mode-Code nicht definiert oder zugewiesen werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Deprecated_octal_literal\">SyntaxError: \"0\"-präfixierte Oktalliterale sind veraltet</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Strict_non_simple_params\">SyntaxError: \"use strict\" nicht erlaubt in Funktion mit nicht einfachen Parametern</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Reserved_identifier\">SyntaxError: \"x\" ist ein reservierter Bezeichner</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_backslash_at_end_of_pattern\">SyntaxError: \\ am Ende des Musters</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Invalid_for-of_initializer\">SyntaxError: Eine Deklaration im Kopf einer for-of-Schleife darf keinen Initialisierer haben</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Delete_in_strict_mode\">SyntaxError: Die Anwendung des 'delete'-Operators auf einen unqualifizierten Namen ist veraltet</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Arguments_not_allowed\">SyntaxError: arguments ist in Feldern nicht gültig</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_await\">SyntaxError: await ist nur in async Funktionen, async Generatoren und Modulen gültig</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/await_yield_in_parameter\">SyntaxError: await/yield expression kann nicht im Parameter verwendet werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_use_nullish_coalescing_unparenthesized\">SyntaxError: `??` kann nicht ohne Klammern innerhalb von `||` und `&&`-Ausdrücken verwendet werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_character_class_escape_in_class_range\">SyntaxError: Zeichenklassen-Escape kann nicht im Klassenbereich im regulären Ausdruck verwendet werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_continue\">SyntaxError: continue muss innerhalb einer Schleife sein</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_duplicate_capture_group_name\">SyntaxError: doppelter Name der Erfassungsgruppe im regulären Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Duplicate_parameter\">SyntaxError: doppeltes formales Argument x</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Invalid_for-in_initializer\">SyntaxError: Deklarationen im Kopf einer for-in-Schleife dürfen keine Initialisierer enthalten</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Unnamed_function_statement\">SyntaxError: Funktionsanweisung erfordert einen Namen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Function_label\">SyntaxError: Funktionen können nicht beschriftet werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Either_be_both_static_or_non-static\">SyntaxError: Getter und Setter für privaten Namen #x sollten entweder beide statisch oder nicht statisch sein</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Getter_no_arguments\">SyntaxError: Getter-Funktionen dürfen keine Argumente haben</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Identifier_after_number\">SyntaxError: identifier startet direkt nach einer numerischen Literal</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Illegal_character\">SyntaxError: illegales Zeichen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/import_decl_module_top_level\">SyntaxError: import-Deklarationen dürfen nur auf der obersten Ebene eines Moduls erscheinen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_incomplete_quantifier\">SyntaxError: unvollständiger Quantifizierer im regulären Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Invalid_assignment_left-hand_side\">SyntaxError: invalid assignment left-hand side</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Invalid_BigInt_syntax\">SyntaxError: Ungültige BigInt-Syntax</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_capture_group_name\">SyntaxError: ungültiger Name der Erfassungsgruppe im regulären Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_char_in_class\">SyntaxError: ungültiges Zeichen in Klasse in regulärem Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_class_set_operation\">SyntaxError: Ungültige Klassenmengenoperation im regulären Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_decimal_escape\">SyntaxError: ungültiger Dezimal-Escape in regulärem Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_identity_escape\">SyntaxError: ungültige Identitätsflucht in regulärem Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_named_capture_reference\">SyntaxError: ungültige benannte Referenz in regulärem Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_property_name\">SyntaxError: ungültiger Eigenschaftsname im regulären Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_range_in_character_class\">SyntaxError: invalid range in character class</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_group\">SyntaxError: invalid regexp group</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_regexp_flag\">SyntaxError: invalid regular expression flag \"x\"</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_invalid_unicode_escape\">SyntaxError: ungültiger Unicode-Escape in regulärem Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/JSON_bad_parse\">SyntaxError: JSON.parse: Fehlerhaftes Parsing</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Label_not_found\">SyntaxError: label not found</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Missing_colon_after_property_id\">SyntaxError: missing : after property id</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Missing_parenthesis_after_argument_list\">SyntaxError: missing ) after argument list</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Missing_parenthesis_after_condition\">SyntaxError: missing ) after condition</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Missing_bracket_after_list\">SyntaxError: missing ] after element list</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Missing_curly_after_function_body\">SyntaxError: fehlende } nach Funktionskörper</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Missing_curly_after_property_list\">SyntaxError: missing } after property list</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Missing_initializer_in_const\">SyntaxError: missing = in const declaration</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Missing_formal_parameter\">SyntaxError: missing formal parameter</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Missing_name_after_dot_operator\">SyntaxError: missing name after . operator</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/No_variable_name\">SyntaxError: missing variable name</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_negated_char_class_with_strings\">SyntaxError: Negierte Zeichenklasse mit Strings im regulären Ausdruck</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_new_optional\">SyntaxError: new-Schlüsselwort kann nicht mit einer Optionalen Kette verwendet werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_nothing_to_repeat\">SyntaxError: nothing to repeat</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_numbers_out_of_order_in_quantifier\">SyntaxError: numbers out of order in {} quantifier.</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Deprecated_octal_escape_sequence\">SyntaxError: Oktale Escape-Sequenzen können nicht in nicht-getaggten Vorlagenliteralen oder im Strict Mode-Code verwendet werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Parameter_after_rest_parameter\">SyntaxError: parameter nach Rest-Parameter</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_delete_private_fields\">SyntaxError: private fields können nicht gelöscht werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Duplicate_proto\">SyntaxError: Eigenschaftenname __proto__ erscheint mehr als einmal im Objektliteral</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Regex_raw_bracket\">SyntaxError: Raw-Klammern sind im regulären Ausdruck mit Unicode-Flag nicht erlaubt</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Redeclared_parameter\">SyntaxError: redeclaration of formal parameter \"x\"</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Undeclared_private_field_or_method\">SyntaxError: Verweis auf nicht deklariertes privates Feld oder Methode #x</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Rest_with_default\">SyntaxError: Restparameter darf keinen Standardwert haben</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_return\">SyntaxError: return not in function</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Setter_one_argument\">SyntaxError: Setter-Funktionen müssen ein Argument haben</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/String_literal_EOL\">SyntaxError: string literal enthält einen nicht-escaped Zeilenumbruch</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_super_call\">SyntaxError: super() ist nur in Konstruktoren abgeleiteter Klassen gültig</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_optional_template\">SyntaxError: getaggtes Template kann nicht mit optionaler Verkettung verwendet werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Hash_outside_class\">SyntaxError: Unerwartetes '#' außerhalb des Klassenkörpers verwendet</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Unexpected_token\">SyntaxError: Unerwartetes Token</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_break\">SyntaxError: unlabeled break muss innerhalb einer Schleife oder eines Switch sein</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Unparenthesized_unary_expr_lhs_exponentiation\">SyntaxError: unverklammerter unärer Ausdruck kann nicht auf der linken Seite von '**' erscheinen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Bad_super_prop\">SyntaxError: Verwendung von Super-Eigenschaften/-mitgliedern ist nur innerhalb von Methoden oder eval-Code innerhalb von Methoden gültig</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Deprecated_source_map_pragma\">SyntaxError: Die Verwendung von //@ zur Angabe von sourceURL-Pragmas ist veraltet. Verwenden Sie stattdessen //#</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/is_not_iterable\">TypeError: 'x' ist nicht iterierbar</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Unexpected_type\">TypeError: \"x\" ist (nicht) \"y\"</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Not_a_constructor\">TypeError: \"x\" ist kein Konstruktor</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Not_a_function\">TypeError: \"x\" ist keine Funktion</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/No_non-null_object\">TypeError: \"x\" ist kein nicht-null-Objekt</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Read-only\">TypeError: \"x\" ist schreibgeschützt</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/BigInt_not_serializable\">TypeError: BigInt-Wert kann nicht in JSON serialisiert werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Builtin_ctor_no_new\">TypeError: Der Aufruf eines eingebauten X-Konstruktors ohne new ist verboten</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Get_set_missing_private\">TypeError: kann nicht auf privates Feld oder Methode zugreifen/setzen: Objekt ist nicht die richtige Klasse</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_assign_to_property\">TypeError: kann Eigenschaft „x“ auf „y“ nicht zuweisen: kein Objekt</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_convert_BigInt_to_number\">TypeError: can't convert BigInt to number</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_convert_x_to_BigInt\">TypeError: kann x nicht in BigInt konvertieren</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_define_property_object_not_extensible\">TypeError: kann Eigenschaft \"x\" nicht definieren: \"obj\" ist nicht erweiterbar</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Non_configurable_array_element\">TypeError: can't delete non-configurable array element</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_redefine_property\">TypeError: kann nicht konfigurierbare Eigenschaft \"x\" neu definieren</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_set_prototype\">TypeError: kann das Prototyp dieses Objekts nicht festlegen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cyclic_prototype\">TypeError: can't set prototype: it would cause a prototype chain cycle</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/in_operator_no_object\">TypeError: kann den 'in'-Operator nicht verwenden, um nach 'x' in 'y' zu suchen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Class_ctor_no_new\">TypeError: Klassenkonstruktoren müssen mit 'new' aufgerufen werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cyclic_object_value\">TypeError: cyclic object value</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Invalid_derived_return\">TypeError: abgeleiteter Klassenkonstruktor hat einen ungültigen Wert x zurückgegeben</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Private_setter_only\">TypeError: getting private setter-only property</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Private_double_initialization\">TypeError: Initialisierung eines Objekts zweimal ist ein Fehler bei privaten Feldern/Methoden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/invalid_right_hand_side_instanceof_operand\">TypeError: ungültiger 'instanceof'-Operand 'x'</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Array_sort_argument\">TypeError: invalides Array.prototype.sort Argument</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Invalid_const_assignment\">TypeError: ungültige Zuweisung zu const \"x\"</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Constructor_cant_be_used_directly\">TypeError: Iterator/AsyncIterator-Konstruktor kann nicht direkt verwendet werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Requires_global_RegExp\">TypeError: matchAll/replaceAll muss mit einem globalen RegExp aufgerufen werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/More_arguments_needed\">TypeError: Mehr Argumente benötigt</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/No_properties\">TypeError: null/undefined hat keine Eigenschaften</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Cant_delete\">TypeError: Eigenschaft \"x\" ist nicht konfigurierbar und kann nicht gelöscht werden</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Reduce_of_empty_array_with_no_initial_value\">TypeError: Reduce eines leeren Arrays ohne initialen Wert</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Getter_only\">TypeError: Einstellung der nur-Getter-Eigenschaft \"x\"</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Key_not_weakly_held\">TypeError: WeakSet-Schlüssel/WeakMap-Wert 'x' muss ein Objekt oder ein nicht registriertes Symbol sein</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Called_on_incompatible_type\">TypeError: X.prototype.y auf inkompatiblen Typ aufgerufen</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Malformed_URI\">URIError: malformed URI sequence</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Already_has_pragma\">Warnung: -file- wird ein //# sourceMappingURL zugewiesen, hat aber bereits eines</a></li><li><a href=\"/de/docs/Web/JavaScript/Reference/Errors/Stmt_after_return\">Warnung: unerreichbarer Code nach return-Anweisung</a></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>Sonstiges</summary>\n <ol>\n <li><a href=\"/de/docs/Web/JavaScript/JavaScript_technologies_overview\">JavaScript-Technologie (Übersicht)</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Lexical_grammar\">Lexikalische Grammatik</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Iteration_protocols\">Iterationsprotokolle</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Strict_mode\">Strenger Modus</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Template_literals\">Vorlagenliterale</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Trailing_commas\">Abschließende Kommas</a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Deprecated_and_obsolete_features\">Veraltete Funktionen</a></li>\n </ol>\n </details>\n </li>\n </ol>\n","sidebarMacro":"JsSidebar","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>Die <strong><code>for...of</code></strong>-Anweisung führt eine Schleife aus, die auf einer Sequenz von Werten arbeitet, die aus einem <a href=\"/de/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterable_protocol\">iterierbaren Objekt</a> stammen. Iterierbare Objekte umfassen Instanzen von integrierten Objekten wie <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Array\"><code>Array</code></a>, <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/String\"><code>String</code></a>, <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/TypedArray\"><code>TypedArray</code></a>, <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Map\"><code>Map</code></a>, <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Set\"><code>Set</code></a>, <a href=\"/de/docs/Web/API/NodeList\"><code>NodeList</code></a> (und anderen DOM-Sammlungen) sowie das <a href=\"/de/docs/Web/JavaScript/Reference/Functions/arguments\"><code>arguments</code></a>-Objekt, <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Generator\">Generatoren</a>, die durch <a href=\"/de/docs/Web/JavaScript/Reference/Statements/function*\">Generatorfunktionen</a> erzeugt werden, und benutzerdefinierte Iterables.</p>"}},{"type":"prose","value":{"id":"probieren_sie_es_aus","title":"Probieren Sie es aus","isH3":false,"content":"<iframe class=\"interactive is-js-height\" height=\"200\" src=\"https://interactive-examples.mdn.mozilla.net/pages/js/statement-forof.html\" title=\"MDN Web Docs Interactive Example\" allow=\"clipboard-write\" loading=\"lazy\"></iframe>"}},{"type":"prose","value":{"id":"syntax","title":"Syntax","isH3":false,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>for (variable of iterable)\n statement\n</code></pre></div>\n<dl>\n <dt id=\"variable\"><a href=\"#variable\"><code>variable</code></a></dt>\n <dd>\n <p>Erhält bei jeder Iteration einen Wert aus der Sequenz. Kann entweder eine Deklaration mit <a href=\"/de/docs/Web/JavaScript/Reference/Statements/const\"><code>const</code></a>, <a href=\"/de/docs/Web/JavaScript/Reference/Statements/let\"><code>let</code></a> oder <a href=\"/de/docs/Web/JavaScript/Reference/Statements/var\"><code>var</code></a> sein oder ein <a href=\"/de/docs/Web/JavaScript/Reference/Operators/Assignment\">Zuweisungsziel</a> (z.B. eine zuvor deklarierte Variable, eine Objekteigenschaft oder ein <a href=\"/de/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment\">Destrukturierungszuweisungsmuster</a>). Mit <code>var</code> deklarierte Variablen sind nicht lokal zur Schleife, d.h. sie befinden sich im gleichen Gültigkeitsbereich wie die <code>for...of</code>-Schleife.</p>\n </dd>\n <dt id=\"iterable\"><a href=\"#iterable\"><code>iterable</code></a></dt>\n <dd>\n <p>Ein iterierbares Objekt. Die Quelle der Wertesequenz, auf die die Schleife operiert.</p>\n </dd>\n <dt id=\"statement\"><a href=\"#statement\"><code>statement</code></a></dt>\n <dd>\n <p>Eine Anweisung, die bei jeder Iteration ausgeführt wird. Kann auf <code>variable</code> verweisen. Sie können eine <a href=\"/de/docs/Web/JavaScript/Reference/Statements/block\">Blockanweisung</a> verwenden, um mehrere Anweisungen auszuführen.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"beschreibung","title":"Beschreibung","isH3":false,"content":"<p>Eine <code>for...of</code>-Schleife arbeitet der Reihe nach auf den Werten eines Iterables. Jede Verarbeitung eines Wertes durch die Schleife wird als eine <em>Iteration</em> bezeichnet, und die Schleife <em>iteriert über das Iterable</em>. Jede Iteration führt Anweisungen aus, die auf den aktuellen Wert der Sequenz verweisen können.</p>\n<p>Wenn eine <code>for...of</code>-Schleife über ein Iterable iteriert, wird zuerst die <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Symbol/iterator\"><code>[Symbol.iterator]()</code></a>-Methode des Iterables aufgerufen, die einen <a href=\"/de/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterator_protocol\">Iterator</a> zurückgibt. Anschließend wird wiederholt die <code>next()</code>-Methode des resultierenden Iterators aufgerufen, um die zu <code>variable</code> zuzuweisende Wertesequenz zu erzeugen.</p>\n<p>Eine <code>for...of</code>-Schleife endet, wenn der Iterator abgeschlossen ist (das <code>next()</code>-Ergebnis ist ein Objekt mit <code>done: true</code>). Wie bei anderen Schleifenbefehlen können Sie <a href=\"/de/docs/Web/JavaScript/Reference/Statements#control_flow\">Steuerflussanweisungen</a> innerhalb von <code>statement</code> verwenden:</p>\n<ul>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/break\"><code>break</code></a> stoppt die Ausführung von <code>statement</code> und geht zur ersten Anweisung nach der Schleife.</li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Statements/continue\"><code>continue</code></a> stoppt die Ausführung von <code>statement</code> und geht zur nächsten Iteration der Schleife über.</li>\n</ul>\n<p>Wenn die <code>for...of</code>-Schleife vorzeitig beendet wird (z.B. wird eine <code>break</code>-Anweisung getroffen oder ein Fehler wird ausgelöst), wird die <a href=\"/de/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterator_protocol\"><code>return()</code></a>-Methode des Iterators aufgerufen, um eine Bereinigung durchzuführen.</p>\n<p>Der <code>variable</code>-Teil von <code>for...of</code> akzeptiert alles, was vor dem <code>=</code>-Operator stehen kann. Sie können <a href=\"/de/docs/Web/JavaScript/Reference/Statements/const\"><code>const</code></a> verwenden, um die Variable zu deklarieren, solange sie nicht im Schleifenkörper neu zugewiesen wird (sie kann sich zwischen den Iterationen ändern, da dies zwei separate Variablen sind). Andernfalls können Sie <a href=\"/de/docs/Web/JavaScript/Reference/Statements/let\"><code>let</code></a> verwenden.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const iterable = [10, 20, 30];\n\nfor (let value of iterable) {\n value += 1;\n console.log(value);\n}\n// 11\n// 21\n// 31\n</code></pre></div>\n<div class=\"notecard note\">\n <p><strong>Hinweis:</strong> Jede Iteration erstellt eine neue Variable. Eine Neuzuordnung der Variable innerhalb des Schleifenkörpers hat keine Auswirkungen auf den ursprünglichen Wert im Iterable (in diesem Fall ein Array).</p>\n</div>\n<p>Sie können <a href=\"/de/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment\">Destrukturierung</a> verwenden, um mehrere lokale Variablen zuzuweisen, oder einen Property-Accessor wie <code>for (x.y of iterable)</code> verwenden, um den Wert einer Objekteigenschaft zuzuweisen.</p>\n<p>Eine spezielle Regel verbietet jedoch die Verwendung von <code>async</code> als Variablennamen. Das ist ungültige Syntax:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js example-bad notranslate\"><code>let async;\nfor (async of [1, 2, 3]); // SyntaxError: The left-hand side of a for-of loop may not be 'async'.\n</code></pre></div>\n<p>Dies soll Syntaxzweideutigkeiten mit dem gültigen Code <code>for (async of => {};;)</code> vermeiden, was eine <a href=\"/de/docs/Web/JavaScript/Reference/Statements/for\"><code>for</code></a>-Schleife ist.</p>"}},{"type":"prose","value":{"id":"beispiele","title":"Beispiele","isH3":false,"content":""}},{"type":"prose","value":{"id":"iterieren_über_ein_array","title":"Iterieren über ein Array","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const iterable = [10, 20, 30];\n\nfor (const value of iterable) {\n console.log(value);\n}\n// 10\n// 20\n// 30\n</code></pre></div>"}},{"type":"prose","value":{"id":"iterieren_über_einen_string","title":"Iterieren über einen String","isH3":true,"content":"<p>Strings werden <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/String/Symbol.iterator\">nach Unicode-Codepunkten iteriert</a>.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const iterable = \"boo\";\n\nfor (const value of iterable) {\n console.log(value);\n}\n// \"b\"\n// \"o\"\n// \"o\"\n</code></pre></div>"}},{"type":"prose","value":{"id":"iterieren_über_ein_typedarray","title":"Iterieren über ein TypedArray","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const iterable = new Uint8Array([0x00, 0xff]);\n\nfor (const value of iterable) {\n console.log(value);\n}\n// 0\n// 255\n</code></pre></div>"}},{"type":"prose","value":{"id":"iterieren_über_eine_map","title":"Iterieren über eine Map","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const iterable = new Map([\n [\"a\", 1],\n [\"b\", 2],\n [\"c\", 3],\n]);\n\nfor (const entry of iterable) {\n console.log(entry);\n}\n// ['a', 1]\n// ['b', 2]\n// ['c', 3]\n\nfor (const [key, value] of iterable) {\n console.log(value);\n}\n// 1\n// 2\n// 3\n</code></pre></div>"}},{"type":"prose","value":{"id":"iterieren_über_ein_set","title":"Iterieren über ein Set","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const iterable = new Set([1, 1, 2, 2, 3, 3]);\n\nfor (const value of iterable) {\n console.log(value);\n}\n// 1\n// 2\n// 3\n</code></pre></div>"}},{"type":"prose","value":{"id":"iterieren_über_das_arguments-objekt","title":"Iterieren über das <code>arguments</code>-Objekt","isH3":true,"content":"<p>Sie können über das <a href=\"/de/docs/Web/JavaScript/Reference/Functions/arguments\"><code>arguments</code></a>-Objekt iterieren, um alle in eine Funktion übergebenen Parameter zu untersuchen.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>function foo() {\n for (const value of arguments) {\n console.log(value);\n }\n}\n\nfoo(1, 2, 3);\n// 1\n// 2\n// 3\n</code></pre></div>"}},{"type":"prose","value":{"id":"iterieren_über_eine_nodelist","title":"Iterieren über eine NodeList","isH3":true,"content":"<p>Das folgende Beispiel fügt Absätzen, die direkte Nachkommen des <a href=\"/de/docs/Web/HTML/Element/article\"><code><article></code></a>-Elements sind, durch Iteration über eine <a href=\"/de/docs/Web/API/NodeList\"><code>NodeList</code></a> DOM-Sammlung eine <code>read</code>-Klasse hinzu.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const articleParagraphs = document.querySelectorAll(\"article > p\");\nfor (const paragraph of articleParagraphs) {\n paragraph.classList.add(\"read\");\n}\n</code></pre></div>"}},{"type":"prose","value":{"id":"iterieren_über_ein_benutzerdefiniertes_iterable","title":"Iterieren über ein benutzerdefiniertes Iterable","isH3":true,"content":"<p>Iterieren über ein Objekt mit einer <code>[Symbol.iterator]()</code>-Methode, die einen benutzerdefinierten Iterator zurückgibt:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const iterable = {\n [Symbol.iterator]() {\n let i = 1;\n return {\n next() {\n if (i <= 3) {\n return { value: i++, done: false };\n }\n return { value: undefined, done: true };\n },\n };\n },\n};\n\nfor (const value of iterable) {\n console.log(value);\n}\n// 1\n// 2\n// 3\n</code></pre></div>\n<p>Iterieren über ein Objekt mit einer <code>[Symbol.iterator]()</code> Generator-Methode:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const iterable = {\n *[Symbol.iterator]() {\n yield 1;\n yield 2;\n yield 3;\n },\n};\n\nfor (const value of iterable) {\n console.log(value);\n}\n// 1\n// 2\n// 3\n</code></pre></div>\n<p><em>Iterierbare Iteratoren</em> (Iteratoren mit einer <code>[Symbol.iterator]()</code>-Methode, die <code>this</code> zurückgibt) sind eine ziemlich gebräuchliche Technik, um Iteratoren in Syntaxen nutzbar zu machen, die Iterable erwarten, wie <code>for...of</code>.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>let i = 1;\n\nconst iterator = {\n next() {\n if (i <= 3) {\n return { value: i++, done: false };\n }\n return { value: undefined, done: true };\n },\n [Symbol.iterator]() {\n return this;\n },\n};\n\nfor (const value of iterator) {\n console.log(value);\n}\n// 1\n// 2\n// 3\n</code></pre></div>"}},{"type":"prose","value":{"id":"iterieren_über_einen_generator","title":"Iterieren über einen Generator","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>function* source() {\n yield 1;\n yield 2;\n yield 3;\n}\n\nconst generator = source();\n\nfor (const value of generator) {\n console.log(value);\n}\n// 1\n// 2\n// 3\n</code></pre></div>"}},{"type":"prose","value":{"id":"vorzeitiges_beenden","title":"Vorzeitiges Beenden","isH3":true,"content":"<p>Die Ausführung der <code>break</code>-Anweisung in der ersten Schleife führt dazu, dass sie vorzeitig beendet wird. Der Iterator ist noch nicht fertig, daher wird die zweite Schleife von dort fortgesetzt, wo die erste aufgehört hat.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const source = [1, 2, 3];\n\nconst iterator = source[Symbol.iterator]();\n\nfor (const value of iterator) {\n console.log(value);\n if (value === 1) {\n break;\n }\n console.log(\"This string will not be logged.\");\n}\n// 1\n\n// Another loop using the same iterator\n// picks up where the last loop left off.\nfor (const value of iterator) {\n console.log(value);\n}\n// 2\n// 3\n\n// The iterator is used up.\n// This loop will execute no iterations.\nfor (const value of iterator) {\n console.log(value);\n}\n// [No output]\n</code></pre></div>\n<p>Generatoren implementieren die <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Generator/return\"><code>return()</code></a>-Methode, die dafür sorgt, dass die Generatorfunktion vorzeitig zurückkehrt, wenn die Schleife beendet wird. Dadurch sind Generatoren nicht zwischen Schleifen wiederverwendbar.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js example-bad notranslate\"><code>function* source() {\n yield 1;\n yield 2;\n yield 3;\n}\n\nconst generator = source();\n\nfor (const value of generator) {\n console.log(value);\n if (value === 1) {\n break;\n }\n console.log(\"This string will not be logged.\");\n}\n// 1\n\n// The generator is used up.\n// This loop will execute no iterations.\nfor (const value of generator) {\n console.log(value);\n}\n// [No output]\n</code></pre></div>"}},{"type":"prose","value":{"id":"unterschied_zwischen_for...of_und_for...in","title":"Unterschied zwischen for...of und for...in","isH3":true,"content":"<p>Sowohl <code>for...in</code> als auch <code>for...of</code>-Anweisungen iterieren über etwas. Der Hauptunterschied zwischen ihnen besteht darin, worüber sie iterieren.</p>\n<p>Die <a href=\"/de/docs/Web/JavaScript/Reference/Statements/for...in\"><code>for...in</code></a>-Anweisung iteriert über die <a href=\"/de/docs/Web/JavaScript/Enumerability_and_ownership_of_properties\">enumerierbaren String-Eigenschaften</a> eines Objekts, während die <code>for...of</code>-Anweisung über Werte iteriert, die das <a href=\"/de/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterable_protocol\">iterierbare Objekt</a> zum Iterieren definiert hat.</p>\n<p>Das folgende Beispiel zeigt den Unterschied zwischen einer <code>for...of</code>-Schleife und einer <code>for...in</code>-Schleife, wenn sie mit einem <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Array\"><code>Array</code></a> verwendet werden.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>Object.prototype.objCustom = function () {};\nArray.prototype.arrCustom = function () {};\n\nconst iterable = [3, 5, 7];\niterable.foo = \"hello\";\n\nfor (const i in iterable) {\n console.log(i);\n}\n// \"0\", \"1\", \"2\", \"foo\", \"arrCustom\", \"objCustom\"\n\nfor (const i in iterable) {\n if (Object.hasOwn(iterable, i)) {\n console.log(i);\n }\n}\n// \"0\" \"1\" \"2\" \"foo\"\n\nfor (const i of iterable) {\n console.log(i);\n}\n// 3 5 7\n</code></pre></div>\n<p>Das Objekt <code>iterable</code> erbt die Eigenschaften <code>objCustom</code> und <code>arrCustom</code>, weil es sowohl <code>Object.prototype</code> als auch <code>Array.prototype</code> in seiner <a href=\"/de/docs/Web/JavaScript/Inheritance_and_the_prototype_chain\">Prototypkette</a> hat.</p>\n<p>Die <code>for...in</code>-Schleife protokolliert nur die <a href=\"/de/docs/Web/JavaScript/Enumerability_and_ownership_of_properties\">enumerierbaren Eigenschaften</a> des Objekts <code>iterable</code>. Sie protokolliert keine Array-<em>Elemente</em> <code>3</code>, <code>5</code>, <code>7</code> oder <code>\"hello\"</code>, weil diese keine <em>Eigenschaften</em> sind - sie sind <em>Werte</em>. Sie protokolliert Array-<em>Indizes</em> sowie <code>arrCustom</code> und <code>objCustom</code>, die tatsächliche Eigenschaften sind. Wenn Sie nicht sicher sind, warum diese Eigenschaften iteriert werden, gibt es eine detailliertere Erklärung dazu, wie <a href=\"/de/docs/Web/JavaScript/Reference/Statements/for...in#array_iteration_and_for...in\">Array-Iteration und <code>for...in</code></a> funktionieren.</p>\n<p>Die zweite Schleife ist der ersten ähnlich, verwendet jedoch <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn\"><code>Object.hasOwn()</code></a>, um zu überprüfen, ob die gefundene enumerierbare Eigenschaft die eigene des Objekts ist, also nicht geerbt. Wenn dies der Fall ist, wird die Eigenschaft protokolliert. Die Eigenschaften <code>0</code>, <code>1</code>, <code>2</code> und <code>foo</code> werden protokolliert, weil sie eigene Eigenschaften sind. Die Eigenschaften <code>arrCustom</code> und <code>objCustom</code> werden nicht protokolliert, weil sie geerbt sind.</p>\n<p>Die <code>for...of</code>-Schleife iteriert über und protokolliert <em>Werte</em>, die <code>iterable</code> als Array (das <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Array/Symbol.iterator\">iterierbar</a> ist) zum Iterieren definiert hat. Die <em>Elemente</em> <code>3</code>, <code>5</code>, <code>7</code> des Objekts werden angezeigt, aber keine der <em>Eigenschaften</em> des Objekts werden protokolliert.</p>"}},{"type":"specifications","value":{"title":"Spezifikationen","id":"spezifikationen","isH3":false,"specifications":[{"bcdSpecificationURL":"https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-for-in-and-for-of-statements","title":"ECMAScript Language Specification"}],"query":"javascript.statements.for_of"}},{"type":"browser_compatibility","value":{"title":"Browser-Kompatibilität","id":"browser-kompatibilität","isH3":false,"query":"javascript.statements.for_of"}},{"type":"prose","value":{"id":"siehe_auch","title":"Siehe auch","isH3":false,"content":"<ul>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach\"><code>Array.prototype.forEach()</code></a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Map/forEach\"><code>Map.prototype.forEach()</code></a></li>\n <li><a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Object/entries\"><code>Object.entries()</code></a></li>\n</ul>"}}],"toc":[{"text":"Probieren Sie es aus","id":"probieren_sie_es_aus"},{"text":"Syntax","id":"syntax"},{"text":"Beschreibung","id":"beschreibung"},{"text":"Beispiele","id":"beispiele"},{"text":"Spezifikationen","id":"spezifikationen"},{"text":"Browser-Kompatibilität","id":"browser-kompatibilität"},{"text":"Siehe auch","id":"siehe_auch"}],"summary":"Die for...of-Anweisung führt eine Schleife aus, die auf einer Sequenz von Werten arbeitet, die aus einem iterierbaren Objekt stammen. Iterierbare Objekte umfassen Instanzen von integrierten Objekten wie Array, String, TypedArray, Map, Set, NodeList (und anderen DOM-Sammlungen) sowie das arguments-Objekt, Generatoren, die durch Generatorfunktionen erzeugt werden, und benutzerdefinierte Iterables.","popularity":0,"modified":"2022-08-14T03:39:57.000Z","other_translations":[{"locale":"en-US","title":"for...of","native":"English (US)"},{"locale":"es","title":"for...of","native":"Español"},{"locale":"fr","title":"for...of","native":"Français"},{"locale":"ja","title":"for...of","native":"日本語"},{"locale":"ko","title":"for...of","native":"한국어"},{"locale":"pt-BR","title":"for...of","native":"Português (do Brasil)"},{"locale":"ru","title":"for...of","native":"Русский"},{"locale":"zh-CN","title":"for...of","native":"中文 (简体)"},{"locale":"zh-TW","title":"for...of","native":"正體中文 (繁體)"}],"pageType":"unknown","source":{"folder":"de/web/javascript/reference/statements/for...of","github_url":"https://github.com/mdn/translated-content/blob/main/files/de/web/javascript/reference/statements/for...of/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/aebcbfc2355fccddc193e6b25ba720935bf90172","filename":"index.md"},"short_title":"for...of","parents":[{"uri":"/de/docs/Web","title":"Web-Technologien für Entwickler"},{"uri":"/de/docs/Web/JavaScript","title":"JavaScript"},{"uri":"/de/docs/Web/JavaScript/Reference","title":"JavaScript-Referenz"},{"uri":"/de/docs/Web/JavaScript/Reference/Statements","title":"Statements und Deklarationen"},{"uri":"/de/docs/Web/JavaScript/Reference/Statements/for...of","title":"for...of"}],"pageTitle":"for...of - JavaScript | MDN","noIndexing":false}}</script></body></html>