{"id":370457,"date":"2023-03-01T14:10:57","date_gmt":"2023-03-01T14:10:57","guid":{"rendered":"https:\/\/webkul.com\/blog\/?p=370457"},"modified":"2024-06-06T06:38:49","modified_gmt":"2024-06-06T06:38:49","slug":"javascript-event-loop","status":"publish","type":"post","link":"https:\/\/webkul.com\/blog\/javascript-event-loop\/","title":{"rendered":"JavaScript Event Loop"},"content":{"rendered":"\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h3 class=\"wp-block-heading index-title\">Agenda:<\/h3>\n<\/div><\/div>\n\n\n\n<ol class=\"wp-block-list\">\n<li>JavaScript Introduction<\/li>\n\n\n\n<li>Call Stack Introduction<\/li>\n\n\n\n<li>Asynchronous Callback<\/li>\n\n\n\n<li>Task Queue<\/li>\n\n\n\n<li>Event Loop<\/li>\n<\/ol>\n\n\n\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h3 class=\"wp-block-heading index-title\">1 JavaScript introduction<\/h3>\n<\/div><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>JavaScript is a single threaded, non-blocking, asynchronous concurrent language.<\/li>\n\n\n\n<li>It has a call stack, an event loop and a callback queue + other APIs.<\/li>\n\n\n\n<li>V8 is the JavaScript engine which has a call stack and a heap.<\/li>\n\n\n\n<li>The heap is used for memory allocation and the stack holds the execution context.<\/li>\n<\/ul>\n\n\n\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h3 class=\"wp-block-heading index-title\">2 <strong>Call Stack Introduction<\/strong><\/h3>\n<\/div><\/div>\n\n\n\n<p class=\"has-medium-font-size\">A call stack is a mechanism for an interpreter (like the JavaScript interpreter in a web browser) to keep track of its place in a script that calls multiple functions \u2014 what function is currently being run and what functions are called from within that function, etc.<\/p>\n\n\n\n<p>Example:-<\/p>\n\n\n\n<p class=\"has-text-align-left\"><strong>1 .<\/strong> Let\u2019s suppose we have a function \u201cgreeting\u201d, \u201csayHi\u201d and we\u2019ve to invoke the \u201cgreeting\u201d.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\">function greeting() {\n  sayHi();\n}\n\nfunction sayHi() {\n  return &quot;Hi!&quot;;\n}\n\n\/\/ Invoke the `greeting` function\ngreeting();<\/pre>\n\n\n\n<p class=\"has-text-align-left\"><strong>2<\/strong>. Know greeting will be include in Call Stack.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"441\" height=\"285\" src=\"https:\/\/cdnblog.webkul.com\/blog\/wp-content\/uploads\/2023\/03\/ELI01.png\" alt=\"This Image use for batter understanding of call stack example\" class=\"wp-image-371412\" srcset=\"https:\/\/cdnblog.webkul.com\/blog\/wp-content\/uploads\/2023\/03\/ELI01.png 441w, https:\/\/cdnblog.webkul.com\/blog\/wp-content\/uploads\/2023\/03\/ELI01-300x194.png 300w, https:\/\/cdnblog.webkul.com\/blog\/wp-content\/uploads\/2023\/03\/ELI01-250x162.png 250w\" sizes=\"(max-width: 441px) 100vw, 441px\" loading=\"lazy\" \/><\/figure>\n<\/div>\n\n\n<p class=\"has-text-align-left\"><strong>3 . <\/strong>We call &#8220;SayHi&#8221; inside the &#8220;greeting()&#8221; so &#8220;sayHi()&#8221; will be included in the call stack.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"504\" height=\"317\" src=\"https:\/\/cdnblog.webkul.com\/blog\/wp-content\/uploads\/2023\/03\/ELI02.png\" alt=\"This Image use for batter understanding of call stack example\" class=\"wp-image-371418\" srcset=\"https:\/\/cdnblog.webkul.com\/blog\/wp-content\/uploads\/2023\/03\/ELI02.png 504w, https:\/\/cdnblog.webkul.com\/blog\/wp-content\/uploads\/2023\/03\/ELI02-300x189.png 300w, https:\/\/cdnblog.webkul.com\/blog\/wp-content\/uploads\/2023\/03\/ELI02-250x157.png 250w\" sizes=\"(max-width: 504px) 100vw, 504px\" loading=\"lazy\" \/><\/figure>\n<\/div>\n\n\n<p><strong>4 .<\/strong> \u201cgreeting\u201d is steel running and  \u201csayHi\u201d return \u201cHi!\u201d.<\/p>\n\n\n\n<p><strong>5 . <\/strong>All the execution context of \u201csayHi\u201d will be destroyed And \u201csayHi\u201d will be thrown out.<\/p>\n\n\n\n<p><strong>5 . <\/strong> And finally \u201cgreeting\u201d will be thrown out.<\/p>\n\n\n\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h3 class=\"wp-block-heading index-title\"><strong>3 ASYNCHRONOUS CALLBACK<\/strong><\/h3>\n<\/div><\/div>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Sometimes the JavaScript code can take a lot of time and this can block the page render.<\/li>\n\n\n\n<li>JavaScript has asynchronous callbacks for non-blocking behaviour.<\/li>\n\n\n\n<li>JavaScript runtime can do only one thing at a time.<\/li>\n\n\n\n<li>Browser gives us other things which work along with the runtime like Web APIs.<\/li>\n\n\n\n<li>In node.js these are available as C++ APIs.<\/li>\n<\/ol>\n\n\n\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h3 class=\"wp-block-heading index-title\"><strong>4 <strong>TASK QUEUE<\/strong><\/strong><\/h3>\n<\/div><\/div>\n\n\n\n<ol class=\"wp-block-list\">\n<li>JavaScript can do only one thing at a time.<\/li>\n\n\n\n<li>The rest are queued to the task queue waiting to be executed.<\/li>\n\n\n\n<li>When we run setTimeout than web APIs will run a timer and push the function provided to setTimeout to the task queue once the timer ends.<\/li>\n\n\n\n<li>These tasks will be pushed to the stack where they can executed.<\/li>\n<\/ol>\n\n\n\n<div class=\"wk-index-wrap\"><div class=\"block-wrap\">\n<h3 class=\"wp-block-heading index-title\">5 <strong>THE EVENT LOOP<\/strong><\/h3>\n<\/div><\/div>\n\n\n\n<ol class=\"wp-block-list\">\n<li>JavaScript has a runtime model based on an event loop, which is responsible for executing the code, collecting and processing events, and executing queued sub-tasks.<\/li>\n\n\n\n<li>The event loop pushes the tasks from the task queue to the call stack.<\/li>\n\n\n\n<li>We can see how these things work in action : <\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-video\"><video height=\"620\" style=\"aspect-ratio: 1294 \/ 620;\" width=\"1294\" autoplay controls loop preload=\"auto\" src=\"https:\/\/cdnblog.webkul.com\/blog\/wp-content\/uploads\/2023\/02\/screen_record_1677569536820.webm\"><\/video><\/figure>\n\n\n\n<p>If you need custom\u00a0<a href=\"https:\/\/webkul.com\/wordpress-theme-development-services\/\" target=\"_blank\" rel=\"noreferrer noopener\">WordPress Development services<\/a>\u00a0then feel free to\u00a0<a href=\"https:\/\/webkul.com\/contacts\" target=\"_blank\" rel=\"noreferrer noopener\">reach us<\/a>.<\/p>\n\n\n\n<p>!!Have a Great Day Ahead!!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A call stack is a mechanism for an interpreter (like the JavaScript interpreter in a web browser) to keep track of its place in a script that calls multiple functions \u2014 what function is currently being run and what functions are called from within that function, etc. Example:- 1 . Let\u2019s suppose we have a <a href=\"https:\/\/webkul.com\/blog\/javascript-event-loop\/\">[&#8230;]<\/a><\/p>\n","protected":false},"author":504,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7966,1260],"tags":[1258,13679,1501],"class_list":["post-370457","post","type-post","status-publish","format-standard","hentry","category-wordpress-woocommerce","category-wordpress","tag-wordpress","tag-wordpress-development-services","tag-wordpress-plugin"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript Event Loop - Webkul Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/webkul.com\/blog\/javascript-event-loop\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript Event Loop - Webkul Blog\" \/>\n<meta property=\"og:description\" content=\"A call stack is a mechanism for an interpreter (like the JavaScript interpreter in a web browser) to keep track of its place in a script that calls multiple functions \u2014 what function is currently being run and what functions are called from within that function, etc. Example:- 1 . 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