{"id":54,"date":"2024-11-06T03:14:13","date_gmt":"2024-11-06T03:14:13","guid":{"rendered":"https:\/\/techkubo.com\/javascript\/?p=54"},"modified":"2025-05-13T10:35:53","modified_gmt":"2025-05-13T10:35:53","slug":"javascript-comments","status":"publish","type":"post","link":"https:\/\/techkubo.com\/javascript\/javascript-comments\/","title":{"rendered":"JavaScript Comments"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>Single-Line Comments<\/strong><\/h2>\n\n\n\n<p>Single-line comments are used to comment out a single line of code. They begin with<code> \/\/<\/code>.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Explanation of Code:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The text following <code>\/\/<\/code> is ignored by the JavaScript engine and is not executed as code.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;javascript&quot;,&quot;mime&quot;:&quot;text\/javascript&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;JavaScript&quot;,&quot;language&quot;:&quot;JavaScript&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;js&quot;}\">\/\/ This is a single-line comment\nlet x = 5;  \/\/ This is another single-line comment<\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Multi-Line Comments<\/strong><\/h2>\n\n\n\n<p>Multi-line comments are used to comment out multiple lines of code. They begin with <code>\/*<\/code> and end with <code>*\/<\/code>.<\/p>\n\n\n\n<p><strong>Explanation of Code: <\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Everything between <code>\/*<\/code> and <code>*\/ <\/code>is ignored by the JavaScript engine.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;javascript&quot;,&quot;mime&quot;:&quot;text\/javascript&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;JavaScript&quot;,&quot;language&quot;:&quot;JavaScript&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;js&quot;}\">\/*\n  This is a multi-line comment\n  It can span multiple lines\n*\/\nlet y = 10;<\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Using Comments for Code Documentation<\/strong><\/h2>\n\n\n\n<p>Comments are not just for temporarily disabling code. They are also used to explain the purpose of code, making it easier for others (or yourself) to understand it later.<\/p>\n\n\n\n<p><strong>Explanation of Code: <\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Comments explain what the code does and the significance of each variable.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;javascript&quot;,&quot;mime&quot;:&quot;text\/javascript&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;JavaScript&quot;,&quot;language&quot;:&quot;JavaScript&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;js&quot;}\">\/\/ Calculate the area of a rectangle\nlet width = 10;  \/\/ Width of the rectangle\nlet height = 20;  \/\/ Height of the rectangle\n\n\/\/ Area is calculated as width multiplied by height\nlet area = width * height;\nconsole.log(&quot;The area of the rectangle is &quot; + area);<\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>JavaScript Comments Example Code<\/strong><\/h2>\n\n\n\n<p><strong>Explanation of Code: <\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Single-Line Comment<\/strong>: Used to describe the variable declaration.<\/li>\n\n\n\n<li><strong>Multi-Line Comment<\/strong>: Used to explain the calculation.<\/li>\n\n\n\n<li><strong>End-of-Line Comment<\/strong>: Used to document the output of the <code>console.log<\/code> statement.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;htmlmixed&quot;,&quot;mime&quot;:&quot;text\/html&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;HTML&quot;,&quot;language&quot;:&quot;HTML&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;html&quot;}\">&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n    &lt;meta charset=&quot;UTF-8&quot;&gt;\n    &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1.0&quot;&gt;\n    &lt;title&gt;JavaScript Comments Example&lt;\/title&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n    &lt;script&gt;\n        \/\/ Single-line comment\n        let x = 5;\n\n        \/*\n          Multi-line comment\n          explaining the calculation\n        *\/\n        let y = 10;\n        let sum = x + y;\n        console.log(&quot;The sum is &quot; + sum);  \/\/ Output: The sum is 15\n    &lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"457\" src=\"https:\/\/techkubo.com\/javascript\/wp-content\/uploads\/sites\/7\/2024\/11\/JS-Comments-Image1.png\" alt=\"\" class=\"wp-image-56\" style=\"width:1200px;height:auto\" srcset=\"https:\/\/techkubo.com\/javascript\/wp-content\/uploads\/sites\/7\/2024\/11\/JS-Comments-Image1.png 1024w, https:\/\/techkubo.com\/javascript\/wp-content\/uploads\/sites\/7\/2024\/11\/JS-Comments-Image1-300x134.png 300w, https:\/\/techkubo.com\/javascript\/wp-content\/uploads\/sites\/7\/2024\/11\/JS-Comments-Image1-768x343.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>JavaScript Labs<\/strong><\/h2>\n\n\n\n<iframe src=\"https:\/\/techkubo.com\/javascript-sim.html\" title=\"Try HTML on TechKubo\" width=\"100%\" height=\"500\"><\/iframe>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Single-Line Comments Single-line comments are used to comment out a single line of code. They begin with \/\/. Explanation of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-54","post","type-post","status-publish","format-standard","hentry","category-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript Comments - JavaScript Tutorial<\/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:\/\/techkubo.com\/javascript\/javascript-comments\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript Comments - JavaScript Tutorial\" \/>\n<meta property=\"og:description\" content=\"Single-Line Comments Single-line comments are used to comment out a single line of code. 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