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srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*JzBLUyeJjZwTxaFLbACO9A.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*JzBLUyeJjZwTxaFLbACO9A.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*JzBLUyeJjZwTxaFLbACO9A.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*JzBLUyeJjZwTxaFLbACO9A.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*JzBLUyeJjZwTxaFLbACO9A.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*JzBLUyeJjZwTxaFLbACO9A.png 1100w, https://miro.medium.com/v2/resize:fit:1140/format:webp/1*JzBLUyeJjZwTxaFLbACO9A.png 1140w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, 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(max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 570px"/><img alt="" class="bh ln mp c" width="570" height="195" loading="eager" role="presentation"/></picture></div><figcaption class="mq ff mr mg mh ms mt bf b bg z du">Get started with Kotlin multi-threading concepts</figcaption></figure><p id="d829" class="pw-post-body-paragraph mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr gn bk">As soon as you start building your Android app, you might need to store some data or values that persist locally over time. <strong class="mw gv">Jetpack Compose</strong> offers two solutions for this: <strong class="mw gv"><em class="ns">Room database</em></strong> and <strong class="mw gv"><em class="ns">DataStore.</em></strong></p><p id="1fce" class="pw-post-body-paragraph mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr gn bk"><strong class="mw gv">Room Database</strong>: As the name suggests, this is a SQLite instance of a database stored on your computer that you can use to store and query structured data from your app using <strong class="mw gv">coroutines. </strong>More on this later in the article.</p><p id="28ab" class="pw-post-body-paragraph mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr gn bk"><strong class="mw gv">Datastore: </strong>This allows you to store key-value pairs, a newer version of <a class="af nt" href="https://developer.android.com/reference/kotlin/android/content/SharedPreferences" rel="noopener ugc nofollow" target="_blank"><em class="ns">SharedPreferences</em></a> to store data, consider migrating to DataStore instead.</p><h1 id="22f5" class="nu nv gu bf nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op oq or bk"><strong class="al">What is coroutine then?</strong></h1><p id="8256" class="pw-post-body-paragraph mu mv gu mw b mx os mz na nb ot nd ne nf ou nh ni nj ov nl nm nn ow np nq nr gn bk">You must have understood why you need persistent storage solutions for your app, then what is <strong class="mw gv"><em class="ns">coroutine</em></strong>, and why you need that.</p><ul class=""><li id="1647" class="mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr ox oy oz bk">The answer to that is, if you have worked with APIs or Databases, we know that every query or request that is executed, takes a significant amount of time, and we can not let our main thread wait for the results.</li><li id="d152" class="mu mv gu mw b mx pa mz na nb pb nd ne nf pc nh ni nj pd nl nm nn pe np nq nr ox oy oz bk">Especially in our case, where we have an app, that has UI and a user continues to interact with the app, then it is recommended that the UI should get updated and the phone should continue to respond to the user`s touch irrespective of what is going on in the background.</li></ul><p id="06ff" class="pw-post-body-paragraph mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr gn bk">So the purpose of the <strong class="mw gv"><em class="ns">coroutine</em></strong> is to perform multi-threading in <strong class="mw gv"><em class="ns">Kotlin</em></strong><em class="ns">,</em> more like handling asynchronous and returns the result when it is completed just like how we have <em class="ns">promises</em>, <em class="ns">async</em> and <em class="ns">await</em> in <strong class="mw gv">React</strong>.</p><h1 id="dde7" class="nu nv gu bf nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op oq or bk">Basic Coroutine concepts and code snippets</h1><p id="c7cd" class="pw-post-body-paragraph mu mv gu mw b mx os mz na nb ot nd ne nf ou nh ni nj ov nl nm nn ow np nq nr gn bk"><strong class="mw gv"><em class="ns">Common terms and keywords to get familiar with:</em></strong></p><ul class=""><li id="a8b6" class="mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr ox oy oz bk"><strong class="mw gv">suspend</strong>: this is used to mark a function in kotlin as asynchronous, which means we can start the execution of code block in this function and can continue to other tasks and don’t have to wait for the previous async function to finish execution.</li><li id="6d4a" class="mu mv gu mw b mx pa mz na nb pb nd ne nf pc nh ni nj pd nl nm nn pe np nq nr ox oy oz bk"><strong class="mw gv">runBlocking { }</strong>: this is an async function that can have a call for other suspend functions, and we can directly use it in our code, this is a self-sufficient function to handle all the requirements to execute async functions.</li><li id="89e0" class="mu mv gu mw b mx pa mz na nb pb nd ne nf pc nh ni nj pd nl nm nn pe np nq nr ox oy oz bk"><strong class="mw gv">launch{}</strong>: this is used to launch the async code block inside it, and return so that we can continue the execution of code outside it while code inside it continues to run.</li><li id="1cee" class="mu mv gu mw b mx pa mz na nb pb nd ne nf pc nh ni nj pd nl nm nn pe np nq nr ox oy oz bk"><strong class="mw gv">async{}: </strong>why do we need this if we already have the <em class="ns">suspend</em> keyword, <em class="ns">async</em> helps us identify the function as async that returns some result, whereas <em class="ns">suspend</em> is used to mark the function as suspended</li><li id="baee" class="mu mv gu mw b mx pa mz na nb pb nd ne nf pc nh ni nj pd nl nm nn pe np nq nr ox oy oz bk"><strong class="mw gv">Deferred<T></strong>: this keyword is optional to use but helps us to identify the variable returned from an <em class="ns">async</em> function</li><li id="8587" class="mu mv gu mw b mx pa mz na nb pb nd ne nf pc nh ni nj pd nl nm nn pe np nq nr ox oy oz bk"><strong class="mw gv">await(): </strong>this waits for the value of the <em class="ns">deferred</em> type object until the <em class="ns">async</em> function is completed and returns the result</li><li id="eb15" class="mu mv gu mw b mx pa mz na nb pb nd ne nf pc nh ni nj pd nl nm nn pe np nq nr ox oy oz bk"><strong class="mw gv">coroutineScope()</strong>: this is used to contain code blocks that can have multiple <em class="ns">coroutine</em> executions running in parallel, but how it is different from <em class="ns">coroutine</em> or<em class="ns"> launch </em>is because, <em class="ns">coroutineScope</em> can be canceled or stopped(due to exceptions), and return only after all the <em class="ns">coroutine</em> inside it has finished</li><li id="bc79" class="mu mv gu mw b mx pa mz na nb pb nd ne nf pc nh ni nj pd nl nm nn pe np nq nr ox oy oz bk"><strong class="mw gv">Job</strong>: as you have observed the <em class="ns">launch</em> returns after starting the execution, then how we can manage the execution of that code, so this <em class="ns">Job </em>helps us to get an instance of the code execution and stop it using <em class="ns">job.cancel()</em></li></ul><p id="df9c" class="pw-post-body-paragraph mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr gn bk">Now we understand all the keywords associated with <em class="ns">Coroutine, </em>let's see them used in the actual code picked up from <a class="af nt" href="https://developer.android.com/codelabs/basic-android-kotlin-compose-coroutines-kotlin-playground?continue=https%3A%2F%2Fdeveloper.android.com%2Fcourses%2Fpathways%2Fandroid-basics-compose-unit-5-pathway-1%23codelab-https%3A%2F%2Fdeveloper.android.com%2Fcodelabs%2Fbasic-android-kotlin-compose-coroutines-kotlin-playground#0" rel="noopener ugc nofollow" target="_blank">here</a></p><pre class="pf pg ph pi pj pk pl pm bp pn bb bk"><span id="d108" class="po nv gu pl b bg pp pq l pr ps">import kotlinx.coroutines.*<br/><br/>fun main() {<br/> runBlocking {<br/> println("Weather forecast")<br/> println(getWeatherReport())<br/> println("Have a good day!")<br/> }<br/>}<br/><br/>suspend fun getWeatherReport() = coroutineScope {<br/> val forecast = async { getForecast() }<br/> val temperature = async { getTemperature() }<br/> "${forecast.await()} ${temperature.await()}"<br/>}<br/><br/>suspend fun getForecast(): String {<br/> delay(1000)<br/> return "Sunny"<br/>}<br/><br/>suspend fun getTemperature(): String {<br/> delay(1000)<br/> return "30\u00b0C"<br/>}</span></pre><p id="7348" class="pw-post-body-paragraph mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr gn bk">Breaking down the code:</p><ul class=""><li id="c079" class="mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr ox oy oz bk"><strong class="mw gv"><em class="ns">getForecast() </em></strong>and <strong class="mw gv"><em class="ns">getTemperature(): </em></strong>are created with the <em class="ns">suspend </em>keyword to mark it as a time-taking function and run on other thread</li><li id="7dd4" class="mu mv gu mw b mx pa mz na nb pb nd ne nf pc nh ni nj pd nl nm nn pe np nq nr ox oy oz bk"><strong class="mw gv"><em class="ns">getWeatherReport():</em></strong> a <em class="ns">coroutineScope </em>is created that contains <strong class="mw gv">2 <em class="ns">async</em> </strong>functions, so it will start the execution of the first <em class="ns">async function</em>, then move to the second <em class="ns">async function </em>to start its execution, and then when it arrives at 3rd line, then it will wait for forecast and temperature to return the value (that also means that async functions have completed), so <strong class="mw gv"><em class="ns">coroutineScope</em></strong> will be completed and return.</li><li id="b9de" class="mu mv gu mw b mx pa mz na nb pb nd ne nf pc nh ni nj pd nl nm nn pe np nq nr ox oy oz bk"><strong class="mw gv">runBlocking()</strong>: this will contain <em class="ns">sync</em> as well as <em class="ns">suspend functions</em> and start its execution in order.</li></ul><p id="97e8" class="pw-post-body-paragraph mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr gn bk">Here is the output of the above function:</p><pre class="pf pg ph pi pj pk pl pm bp pn bb bk"><span id="0d85" class="po nv gu pl b bg pp pq l pr ps">Weather forecast<br/>Sunny 30°C<br/>Have a good day!</span></pre><h2 id="427c" class="pt nv gu bf nw pu pv dy oa pw px ea oe nf py pz qa nj qb qc qd nn qe qf qg qh bk">Extra brownie points</h2><ul class=""><li id="0f76" class="mu mv gu mw b mx os mz na nb ot nd ne nf ou nh ni nj ov nl nm nn ow np nq nr ox oy oz bk">A <em class="ns">coroutineScope</em> will be returned if and only if all the <em class="ns">coroutine</em> launched inside have been completed or canceled (if some throw an exception or explicitly canceled) like the following example code block</li></ul><pre class="pf pg ph pi pj pk pl pm bp pn bb bk"><span id="5896" class="po nv gu pl b bg pp pq l pr ps">...<br/><br/>suspend fun getWeatherReport() = coroutineScope {<br/> val forecast = async { getForecast() }<br/> val temperature = async { getTemperature() }<br/> <br/> delay(200)<br/> temperature.cancel()<br/><br/> "${forecast.await()}"<br/>}<br/><br/>...<br/><br/><br/>//Output <br/>Weather forecast<br/>Sunny<br/>Have a good day!</span></pre><ul class=""><li id="9f83" class="mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr ox oy oz bk">how to handle the execution launched by <em class="ns">launch</em> keyword, by using its instance in a variable as <strong class="mw gv"><em class="ns">Job</em></strong>, this can contain a <em class="ns">coroutine </em>that can itself have another <em class="ns">coroutine</em> inside it (kind of parent-child relationships), so when we cancel a <em class="ns">parent coroutine, </em>it cancels all the child coroutine also</li></ul><pre class="pf pg ph pi pj pk pl pm bp pn bb bk"><span id="ceda" class="po nv gu pl b bg pp pq l pr ps">val job = launch {<br/> ... <br/><br/> val childJob = launch { ... }<br/><br/> ...<br/>}<br/><br/>...<br/><br/>//cancelled using <br/><br/>job.cancel()</span></pre><ul class=""><li id="9fe9" class="mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr ox oy oz bk">A particular <em class="ns">coroutine</em> can be identified using, all its information about the <em class="ns">context</em> in which the <em class="ns">coroutine</em> is running in is:</li></ul><pre class="pf pg ph pi pj pk pl pm bp pn bb bk"><span id="2124" class="po nv gu pl b bg pp pq l pr ps">CouroutineContext = Job() + Dispatchers.Main + exceptionHandler</span></pre><ul class=""><li id="a8b9" class="mu mv gu mw b mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr ox oy oz bk">We can choose where to execute our blocking code away from the <strong class="mw gv"><em class="ns">main</em></strong> thread, kotlin provides 3 types of Dispatchers: <em class="ns">Dispatchers.Main</em>, <em class="ns">Dispatchers.IO, Dispatchers.Default. </em>Dispatchers mean a thread can be started, does some work (executes some code), and then terminates when there’s no more work to be done, example below</li></ul><pre class="pf pg ph pi pj pk pl pm bp pn bb bk"><span id="cf29" class="po nv gu pl b bg pp pq l pr ps">import kotlinx.coroutines.*<br/><br/>fun main() {<br/> runBlocking {<br/> println("${Thread.currentThread().name} - runBlocking function")<br/> launch {<br/> println("${Thread.currentThread().name} - launch function")<br/> withContext(Dispatchers.Default) {<br/> println("${Thread.currentThread().name} - withContext function")<br/> delay(1000)<br/> println("10 results found.")<br/> }<br/> println("${Thread.currentThread().name} - end of launch function")<br/> }<br/> println("Loading...")<br/> }<br/>}<br/><br/><br/>//Output<br/><br/>main @coroutine#1 - runBlocking function<br/>Loading...<br/>main @coroutine#2 - launch function<br/>DefaultDispatcher-worker-1 @coroutine#2 - withContext function<br/>10 results found.<br/>main @coroutine#2 - end of launch function</span></pre><h2 id="34b5" class="pt nv gu bf nw pu pv dy oa pw px ea oe nf py pz qa nj qb qc qd nn qe qf qg qh bk">Summary</h2><p id="836b" class="pw-post-body-paragraph mu mv gu mw b mx os mz na nb ot nd ne nf ou nh ni nj ov nl nm nn ow np nq nr gn bk">In conclusion, the coroutine is a powerful tool for writing async code that is a necessity when we write Networking code or Database queries. 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result","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":9,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":41,"end":49,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":72,"end":77,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_18":{"__typename":"Paragraph","id":"81c645a573e0_18","name":"eb15","type":"ULI","href":null,"layout":null,"metadata":null,"text":"coroutineScope(): this is used to contain code blocks that can have multiple coroutine executions running in parallel, but how it is different from coroutine or launch is because, coroutineScope can be canceled or stopped(due to exceptions), and return only after all the coroutine inside it has 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as you have observed the launch returns after starting the execution, then how we can manage the execution of that code, so this Job helps us to get an instance of the code execution and stop it using job.cancel()","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":3,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":30,"end":36,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":134,"end":138,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":206,"end":218,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_20":{"__typename":"Paragraph","id":"81c645a573e0_20","name":"df9c","type":"P","href":null,"layout":null,"metadata":null,"text":"Now we understand all the keywords 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println(\"Weather forecast\")\n println(getWeatherReport())\n println(\"Have a good day!\")\n }\n}\n\nsuspend fun getWeatherReport() = coroutineScope {\n val forecast = async { getForecast() }\n val temperature = async { getTemperature() }\n \"${forecast.await()} ${temperature.await()}\"\n}\n\nsuspend fun getForecast(): String {\n delay(1000)\n return \"Sunny\"\n}\n\nsuspend fun getTemperature(): String {\n delay(1000)\n return \"30\\u00b0C\"\n}","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_22":{"__typename":"Paragraph","id":"81c645a573e0_22","name":"7348","type":"P","href":null,"layout":null,"metadata":null,"text":"Breaking down the 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first async function, then move to the second async function to start its execution, and then when it arrives at 3rd line, then it will wait for forecast and temperature to return the value (that also means that async functions have completed), so coroutineScope will be completed and 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this will contain sync as well as suspend functions and start its execution in order.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":13,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":33,"end":37,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":49,"end":66,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_26":{"__typename":"Paragraph","id":"81c645a573e0_26","name":"97e8","type":"P","href":null,"layout":null,"metadata":null,"text":"Here is the output of the above function:","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_27":{"__typename":"Paragraph","id":"81c645a573e0_27","name":"0d85","type":"PRE","href":null,"layout":null,"metadata":null,"text":"Weather forecast\nSunny 30°C\nHave a good day!","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"css"},"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_28":{"__typename":"Paragraph","id":"81c645a573e0_28","name":"427c","type":"H4","href":null,"layout":null,"metadata":null,"text":"Extra brownie points","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_29":{"__typename":"Paragraph","id":"81c645a573e0_29","name":"0f76","type":"ULI","href":null,"layout":null,"metadata":null,"text":"A coroutineScope will be returned if and only if all the coroutine launched inside have been completed or canceled (if some throw an exception or explicitly canceled) like the following example code block","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"EM","start":2,"end":16,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":57,"end":66,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_30":{"__typename":"Paragraph","id":"81c645a573e0_30","name":"5896","type":"PRE","href":null,"layout":null,"metadata":null,"text":"...\n\nsuspend fun getWeatherReport() = coroutineScope {\n val forecast = async { getForecast() }\n val temperature = async { getTemperature() }\n \n delay(200)\n temperature.cancel()\n\n \"${forecast.await()}\"\n}\n\n...\n\n\n\u002F\u002FOutput \nWeather forecast\nSunny\nHave a good day!","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_31":{"__typename":"Paragraph","id":"81c645a573e0_31","name":"9f83","type":"ULI","href":null,"layout":null,"metadata":null,"text":"how to handle the execution launched by launch keyword, by using its instance in a variable as Job, this can contain a coroutine that can itself have another coroutine inside it (kind of parent-child relationships), so when we cancel a parent coroutine, it cancels all the child coroutine also","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":95,"end":98,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":40,"end":46,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":95,"end":98,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":119,"end":129,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":158,"end":167,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":236,"end":254,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_32":{"__typename":"Paragraph","id":"81c645a573e0_32","name":"ceda","type":"PRE","href":null,"layout":null,"metadata":null,"text":"val job = launch {\n ... \n\n val childJob = launch { ... }\n\n ...\n}\n\n...\n\n\u002F\u002Fcancelled using \n\njob.cancel()","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"EXPLICIT","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_33":{"__typename":"Paragraph","id":"81c645a573e0_33","name":"9fe9","type":"ULI","href":null,"layout":null,"metadata":null,"text":"A particular coroutine can be identified using, all its information about the context in which the coroutine is running in is:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"EM","start":13,"end":22,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":78,"end":85,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":99,"end":108,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_34":{"__typename":"Paragraph","id":"81c645a573e0_34","name":"2124","type":"PRE","href":null,"layout":null,"metadata":null,"text":"CouroutineContext = Job() + Dispatchers.Main + exceptionHandler","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"ini"},"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_35":{"__typename":"Paragraph","id":"81c645a573e0_35","name":"a8b9","type":"ULI","href":null,"layout":null,"metadata":null,"text":"We can choose where to execute our blocking code away from the main thread, kotlin provides 3 types of Dispatchers: Dispatchers.Main, Dispatchers.IO, Dispatchers.Default. Dispatchers mean a thread can be started, does some work (executes some code), and then terminates when there’s no more work to be done, example below","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":63,"end":67,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":63,"end":67,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":116,"end":132,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":134,"end":171,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_36":{"__typename":"Paragraph","id":"81c645a573e0_36","name":"cf29","type":"PRE","href":null,"layout":null,"metadata":null,"text":"import kotlinx.coroutines.*\n\nfun main() {\n runBlocking {\n println(\"${Thread.currentThread().name} - runBlocking function\")\n launch {\n println(\"${Thread.currentThread().name} - launch function\")\n withContext(Dispatchers.Default) {\n println(\"${Thread.currentThread().name} - withContext function\")\n delay(1000)\n println(\"10 results found.\")\n }\n println(\"${Thread.currentThread().name} - end of launch function\")\n }\n println(\"Loading...\")\n }\n}\n\n\n\u002F\u002FOutput\n\nmain @coroutine#1 - runBlocking function\nLoading...\nmain @coroutine#2 - launch function\nDefaultDispatcher-worker-1 @coroutine#2 - withContext function\n10 results found.\nmain @coroutine#2 - end of launch function","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_37":{"__typename":"Paragraph","id":"81c645a573e0_37","name":"34b5","type":"H4","href":null,"layout":null,"metadata":null,"text":"Summary","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_38":{"__typename":"Paragraph","id":"81c645a573e0_38","name":"836b","type":"P","href":null,"layout":null,"metadata":null,"text":"In conclusion, the coroutine is a powerful tool for writing async code that is a necessity when we write Networking code or Database queries. Hope you have an understanding of the coroutine, follow this article on how to create a Room database and write operations using the coroutine.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":230,"end":243,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":180,"end":189,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":275,"end":284,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_39":{"__typename":"Paragraph","id":"81c645a573e0_39","name":"2ab5","type":"P","href":null,"layout":null,"metadata":null,"text":"Happy Coding!!!","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_40":{"__typename":"Paragraph","id":"81c645a573e0_40","name":"ff8e","type":"P","href":null,"layout":null,"metadata":null,"text":"Please don’t forget to give claps 👏 and share this with your fellow coder friends.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:81c645a573e0_41":{"__typename":"Paragraph","id":"81c645a573e0_41","name":"c924","type":"BQ","href":null,"layout":null,"metadata":null,"text":"Follow me to look into other repos covering new concepts in all the programming 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