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Ansari1120Ansari1120
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More Asyncs
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‎Async code after main thread.js

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//Asynchronous code is always executed after the main thread
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setTimeout(function() { //this code executed at the end.
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console.log('I am an asynchronous message');
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}); // You can omit the 0
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console.log('Test 1');
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for (let i = 0; i < 10000; ++i) {
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doSomeStuff();
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}
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console.log('Test 2');
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// The 'I am an asynchronous message' will be displayed when the main thread reach here
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function doSomeStuff() {
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return 1 + 1;
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}

‎Async working example.html

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<!doctype html>
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<html>
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<head>
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</head>
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<body>
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<button id="sync" onclick="request(false);">Synchronous button</button>
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<br />
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<button id="async" onclick="request(true);">Asynchronous button</button>
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<div id="content"></div>
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<script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
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<script type="text/javascript">
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var requesting = false;
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function request(async) {
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if (requesting) {
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return;
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}
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requesting = true;
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var content = $('#content');
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content.text('Requesting ...');
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$.ajax({
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url: 'content.html',
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async: async,
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success: function(data) {
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content.text(data);
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requesting = false;
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}
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});
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}
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</script>
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</body>
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</html>

‎Asynchronous code using setInterval.js

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//Asynchronous code using setInterval
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let counter = 0;
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let timer = setInterval(function() {
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console.log('I am an asynchronous message');
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counter += 1;
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if (counter >= 5) {
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clearInterval(timer);
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}
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}, 2000);
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console.log('I am a synchronous message');
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//setInterval has the same behavior as setTimeout but the code is executed multiple times.
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//You have to call clearInterval to kill the timer.
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// Performing an HTTP request
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// Any I/O operation when you are in a NodeJS environment
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// Dealing with a WebSocket (client or server side)

‎Promise moreover.js

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// //First promise example
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// var promise = new Promise(function(resolve, reject) {
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// setTimeout(function() {
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// resolve('hello world');
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// }, 2000);
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// });
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// promise.then(function(data) {
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// console.log(data);
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// });
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// //Multiple Callbacks
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// // var promise = new Promise(function(resolve, reject) {
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// // setTimeout(function() {
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// // resolve('hello world');
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// // }, 2000);
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// // });
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// // promise.then(function(data) {
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// // console.log(data + ' 1');
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// // });
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// // promise.then(function(data) {
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// // console.log(data + ' 2');
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// // });
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// // promise.then(function(data) {
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// // console.log(data + ' 3');
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// // });
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// //Error handling when error happen
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// // var promise = new Promise(function(resolve, reject) {
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// // setTimeout(function() {
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// // reject('We are all going to die');
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// // }, 2000);
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// // });
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// // promise.then(function success(data) {
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// // console.log(data);
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// // }, function error(data) {
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// // console.error(data);
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// // });
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// //When an error happens with multiple callbacks
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// var promise = new Promise(function(resolve, reject) {
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// setTimeout(function() {
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// reject('We are all going to die');
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// }, 2000);
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// });
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// promise.then(function success(data) {
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// console.log(data + ' 1');
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// }, function error(data) {
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// console.error(data + ' 1');
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// });
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// promise.then(function success(data) {
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// console.log(data + ' 2');
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// }, function error(data) {
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// console.error(data + ' 2');
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// });
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// promise.then(function success(data) {
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// console.log(data + ' 3');
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// }, function error(data) {
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// console.error(data + ' 3');
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// });
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// Calling resolve multiple times
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var promise = new Promise(function(resolve, reject) {
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setTimeout(function() {
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resolve('hello world 1');
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resolve('hello world 2');
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resolve('hello world 3');
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resolve('hello world 4');
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}, 1000);
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});
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promise.then(function success(data) {
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console.log(data);
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});

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