{"appState":{"pageLoadApiCallsStatus":true},"articleState":{"article":{"headers":{"creationTime":"2016-03-26T07:38:44+00:00","modifiedTime":"2016-03-26T07:38:44+00:00","timestamp":"2022-09-14T17:51:05+00:00"},"data":{"breadcrumbs":[{"name":"Technology","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33512"},"slug":"technology","categoryId":33512},{"name":"Programming & Web Design","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33592"},"slug":"programming-web-design","categoryId":33592},{"name":"JavaScript","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33603"},"slug":"javascript","categoryId":33603}],"title":"How to Use the JavaScript Developer Console","strippedTitle":"how to use the javascript developer console","slug":"how-to-use-the-javascript-developer-console","canonicalUrl":"","seo":{"metaDescription":"Sometimes, it’s helpful to be able to run JavaScript commands without creating an HTML page and including separate scripts or creating blocks. For these times, ","noIndex":0,"noFollow":0},"content":"<p>Sometimes, it’s helpful to be able to run JavaScript commands without creating an HTML page and including separate scripts or creating <span class=\"code\"><script></span> blocks. For these times, you can use the Chrome browser’s JavaScript Console.</p>\n<p>To access the JavaScript Console, find the Chrome menu in the upper-right corner of your browser. It looks like three horizontal lines. Click the Chrome menu and then find More Tools in the drop-down menu. Under More Tools, choose JavaScript Console from the drop-down menu.</p>\n<p>And, yes, there is a faster way to open the JavaScript Console. Simply press Alt+Command+J (on Mac) or Control+Shift+J (on Windows).</p>\n<div class=\"imageBlock\" style=\"width:531px;\"><img src=\"https://www.dummies.com/wp-content/uploads/481997.image0.jpg\" height=\"425\" alt=\"JavaScript Console in the Chrome browser.\" width=\"531\"/><div class=\"imageCaption\">JavaScript Console in the Chrome browser.</div></div>\n<p class=\"TechnicalStuff\">The JavaScript Console is perhaps the best friend of the JavaScript developer. Besides allowing you to test and run JavaScript code quickly and easily, it also is where errors in your code are reported, and it has features that will help you track down and solve problems with your code.</p>\n<p>Once you’ve opened the JavaScript console, you can start inputting commands into it, which will run as soon as you press Enter. To try it out, open the JavaScript console and then type the following commands, pressing Enter after each one:</p>\n<pre class=\"code\">1080/33\n40 + 2\n40 * 34\n100%3\n34++\n34--</pre>\n<h2 id=\"tab1\" >Commenting your code</h2>\n<p>As you learn more JavaScript commands and start to write larger programs, it’s often helpful to be able to leave yourself little reminders of what you were thinking or what certain things do. In programmer-speak, these tiny notes are called (or to anyone else who may work with your code) <i>comments.</i> The process of writing these notes is called <i>commenting.</i></p>\n<p class=\"Remember\">The JavaScript engine completely ignores comments. They are there just for people. This is your time to explain things, clarify things, describe your thinking, or even leave reminders to yourself about things you want to do in the future.</p>\n<p>It is always a good idea to comment your code. Even if you think that your code is pretty self-explanatory at the time that you write it, you won’t think that eight months down the road when you need to modify it.</p>\n<p>JavaScript gives you two ways to denote something as a comment:</p>\n<ul class=\"level-one\">\n <li><p class=\"first-para\">The single-line comment</p>\n </li>\n <li><p class=\"first-para\">The multi-line comment</p>\n </li>\n</ul>\n<h2 id=\"tab2\" >Single-line comments</h2>\n<p>Single-line comments start with <span class=\"code\">//</span>. Everything after these two slashes and up until the end of the line will be ignored by the JavaScript parser.</p>\n<p>Single-line comments don’t need to start at the beginning of a line. It’s quite common to see a single-line comment used on the same line as a piece of code that is not commented, in order to explain what that line means. For example:</p>\n<pre class=\"code\">pizzas = pizza + 1; // add one more pizza</pre>\n<h2 id=\"tab3\" >Multi-line comments</h2>\n<p>Multi-line comments start with <span class=\"code\">/*</span> and tell the JavaScript parser to ignore everything up to <span class=\"code\">*/</span>. Multi-line comments are useful for more extensive documentation of code. For example:</p>\n<pre class=\"code\">/* The countToTen function does the following things:\n * Initializes a variable called count\n * Starts a loop by checking the value of count to make sure it’s less than 10\n * Adds 1 to the value of count\n * Appends the the current value of count, followed by a line break, to the paragraph with id=‘theCount’\n * Starts the loop over\n*/</pre>\n<h2 id=\"tab4\" >Using comments to prevent code execution</h2>\n<p>Besides being useful for documenting code, comments are often useful for isolating pieces of code in order to find problems. For example, if you wanted to see what the <span class=\"code\">countToTen</span> function would do if you removed the line from the loop that increments the value of count, you could comment out that line using a single-line comment, like this:</p>\n<pre class=\"code\">function countToTen(){\n var count = 0;\n while (count < 10) {\n // count++;\n document.getElementById(“theCount”).innerHTML +=\ncount + “<br>“;\n }\n}</pre>\n<p>When you run this program, the line <span class=\"code\">count++;</span> will no longer run, and the program will print out 0s forever (or until you close the browser window).</p>\n<p class=\"Warning\">This is called an <i>infinite loop.</i> If you do run a modified version of this program, it won’t do any harm to your computer, but it will likely take your CPU for a wild ride of spinning in circles as fast as it can until you shut down the browser window in which you opened it in.</p>","description":"<p>Sometimes, it’s helpful to be able to run JavaScript commands without creating an HTML page and including separate scripts or creating <span class=\"code\"><script></span> blocks. For these times, you can use the Chrome browser’s JavaScript Console.</p>\n<p>To access the JavaScript Console, find the Chrome menu in the upper-right corner of your browser. It looks like three horizontal lines. Click the Chrome menu and then find More Tools in the drop-down menu. Under More Tools, choose JavaScript Console from the drop-down menu.</p>\n<p>And, yes, there is a faster way to open the JavaScript Console. Simply press Alt+Command+J (on Mac) or Control+Shift+J (on Windows).</p>\n<div class=\"imageBlock\" style=\"width:531px;\"><img src=\"https://www.dummies.com/wp-content/uploads/481997.image0.jpg\" height=\"425\" alt=\"JavaScript Console in the Chrome browser.\" width=\"531\"/><div class=\"imageCaption\">JavaScript Console in the Chrome browser.</div></div>\n<p class=\"TechnicalStuff\">The JavaScript Console is perhaps the best friend of the JavaScript developer. Besides allowing you to test and run JavaScript code quickly and easily, it also is where errors in your code are reported, and it has features that will help you track down and solve problems with your code.</p>\n<p>Once you’ve opened the JavaScript console, you can start inputting commands into it, which will run as soon as you press Enter. To try it out, open the JavaScript console and then type the following commands, pressing Enter after each one:</p>\n<pre class=\"code\">1080/33\n40 + 2\n40 * 34\n100%3\n34++\n34--</pre>\n<h2 id=\"tab1\" >Commenting your code</h2>\n<p>As you learn more JavaScript commands and start to write larger programs, it’s often helpful to be able to leave yourself little reminders of what you were thinking or what certain things do. In programmer-speak, these tiny notes are called (or to anyone else who may work with your code) <i>comments.</i> The process of writing these notes is called <i>commenting.</i></p>\n<p class=\"Remember\">The JavaScript engine completely ignores comments. They are there just for people. This is your time to explain things, clarify things, describe your thinking, or even leave reminders to yourself about things you want to do in the future.</p>\n<p>It is always a good idea to comment your code. Even if you think that your code is pretty self-explanatory at the time that you write it, you won’t think that eight months down the road when you need to modify it.</p>\n<p>JavaScript gives you two ways to denote something as a comment:</p>\n<ul class=\"level-one\">\n <li><p class=\"first-para\">The single-line comment</p>\n </li>\n <li><p class=\"first-para\">The multi-line comment</p>\n </li>\n</ul>\n<h2 id=\"tab2\" >Single-line comments</h2>\n<p>Single-line comments start with <span class=\"code\">//</span>. Everything after these two slashes and up until the end of the line will be ignored by the JavaScript parser.</p>\n<p>Single-line comments don’t need to start at the beginning of a line. It’s quite common to see a single-line comment used on the same line as a piece of code that is not commented, in order to explain what that line means. For example:</p>\n<pre class=\"code\">pizzas = pizza + 1; // add one more pizza</pre>\n<h2 id=\"tab3\" >Multi-line comments</h2>\n<p>Multi-line comments start with <span class=\"code\">/*</span> and tell the JavaScript parser to ignore everything up to <span class=\"code\">*/</span>. Multi-line comments are useful for more extensive documentation of code. For example:</p>\n<pre class=\"code\">/* The countToTen function does the following things:\n * Initializes a variable called count\n * Starts a loop by checking the value of count to make sure it’s less than 10\n * Adds 1 to the value of count\n * Appends the the current value of count, followed by a line break, to the paragraph with id=‘theCount’\n * Starts the loop over\n*/</pre>\n<h2 id=\"tab4\" >Using comments to prevent code execution</h2>\n<p>Besides being useful for documenting code, comments are often useful for isolating pieces of code in order to find problems. For example, if you wanted to see what the <span class=\"code\">countToTen</span> function would do if you removed the line from the loop that increments the value of count, you could comment out that line using a single-line comment, like this:</p>\n<pre class=\"code\">function countToTen(){\n var count = 0;\n while (count < 10) {\n // count++;\n document.getElementById(“theCount”).innerHTML +=\ncount + “<br>“;\n }\n}</pre>\n<p>When you run this program, the line <span class=\"code\">count++;</span> will no longer run, and the program will print out 0s forever (or until you close the browser window).</p>\n<p class=\"Warning\">This is called an <i>infinite loop.</i> If you do run a modified version of this program, it won’t do any harm to your computer, but it will likely take your CPU for a wild ride of spinning in circles as fast as it can until you shut down the browser window in which you opened it in.</p>","blurb":"","authors":[{"authorId":9070,"name":"Chris Minnick","slug":"chris-minnick","description":" <p>This All-in-One includes work by expert coders and coding educators, including <b>Chris Minnick and Eva Holland </b>coauthors of<i> Coding with JavaScript For Dummies</i>; <b>Nikhil Abraham,</b> author of <i>Coding For Dummies</i> and <i>Getting a Coding Job For Dummies;</i> <b>John Paul Mueller and Luca Massaron,</b> coauthors of <i>Python for Data Science For Dummies</i> and <i>Machine Learning For Dummies;</i> and <b>Barry Burd,</b> author of<i> Flutter For Dummies.</i></p> ","hasArticle":false,"_links":{"self":"https://dummies-api.dummies.com/v2/authors/9070"}},{"authorId":9071,"name":"Eva Holland","slug":"eva-holland","description":" <p><b>Chris Minnick</b> is an accomplished author, trainer, and web developer who has worked on web and mobile projects for both small and major businesses. <b>Eva Holland</b> is an experienced writer and trainer who has designed and taught online, in-person, and video courses. They are cofounders of WatzThis? ","hasArticle":false,"_links":{"self":"https://dummies-api.dummies.com/v2/authors/9071"}}],"primaryCategoryTaxonomy":{"categoryId":33603,"title":"JavaScript","slug":"javascript","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33603"}},"secondaryCategoryTaxonomy":{"categoryId":33599,"title":"Coding","slug":"coding","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33599"}},"tertiaryCategoryTaxonomy":{"categoryId":0,"title":null,"slug":null,"_links":null},"trendingArticles":[{"articleId":175788,"title":"Trig Identities for Pre-Calculus","slug":"trig-identities-for-pre-calculus","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"/articles/175788"}},{"articleId":147241,"title":"How to Use the Z-Table","slug":"how-to-use-the-z-table","categoryList":["academics-the-arts","math","statistics"],"_links":{"self":"/articles/147241"}},{"articleId":192609,"title":"How to Pray the Rosary: A Comprehensive 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Sheet","slug":"javascript-for-dummies-cheat-sheet","categoryList":["technology","programming-web-design","javascript"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/207619"}},{"articleId":207525,"title":"Coding with JavaScript For Dummies Cheat Sheet","slug":"coding-with-javascript-for-dummies-cheat-sheet","categoryList":["technology","programming-web-design","javascript"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/207525"}},{"articleId":203241,"title":"10 Online Tools to Help You Write Better JavaScript","slug":"10-online-tools-to-help-you-write-better-javascript","categoryList":["technology","programming-web-design","javascript"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/203241"}},{"articleId":203240,"title":"10 JavaScript Frameworks and Libraries to Learn Next","slug":"10-javascript-frameworks-and-libraries-to-learn-next","categoryList":["technology","programming-web-design","javascript"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/203240"}},{"articleId":144114,"title":"List of HTML5 APIs for Coding with JavaScript","slug":"list-of-html5-apis-for-coding-with-javascript","categoryList":["technology","programming-web-design","javascript"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/144114"}}],"fromCategory":[{"articleId":209047,"title":"jQuery For Dummies Cheat Sheet","slug":"jquery-for-dummies-cheat-sheet","categoryList":["technology","programming-web-design","javascript"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/209047"}},{"articleId":207619,"title":"JavaScript For Dummies Cheat 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with JavaScript For Dummies","testBankPinActivationLink":"","bookOutOfPrint":false,"authorsInfo":"<p><b data-author-id=\"9070\">Chris Minnick</b> is an accomplished author, trainer, and web developer who has worked on web and mobile projects for both small and major businesses. <b data-author-id=\"9071\">Eva Holland</b> is an experienced writer and trainer who has designed and taught online, in-person, and video courses. They are cofounders of WatzThis? </p>","authors":[{"authorId":9070,"name":"Chris Minnick","slug":"chris-minnick","description":" <p>This All-in-One includes work by expert coders and coding educators, including <b>Chris Minnick and Eva Holland </b>coauthors of<i> Coding with JavaScript For Dummies</i>; <b>Nikhil Abraham,</b> author of <i>Coding For Dummies</i> and <i>Getting a Coding Job For Dummies;</i> <b>John Paul Mueller and Luca Massaron,</b> coauthors of <i>Python for Data Science For Dummies</i> and <i>Machine Learning For Dummies;</i> and <b>Barry Burd,</b> author of<i> Flutter For Dummies.</i></p> ","hasArticle":false,"_links":{"self":"https://dummies-api.dummies.com/v2/authors/9070"}},{"authorId":9071,"name":"Eva Holland","slug":"eva-holland","description":" <p><b>Chris Minnick</b> is an accomplished author, trainer, and web developer who has worked on web and mobile projects for both small and major businesses. <b>Eva Holland</b> is an experienced writer and trainer who has designed and taught online, in-person, and video courses. They are cofounders of WatzThis? 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How to Use the JavaScript Developer Console

By: Chris Minnick and Eva Holland and

Updated: 03-26-2016

From The Book: Coding with JavaScript For Dummies

Coding with JavaScript For Dummies

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Sometimes, it’s helpful to be able to run JavaScript commands without creating an HTML page and including separate scripts or creating

About This Article

This article is from the book:

Coding with JavaScript For Dummies ,

About the book authors:

Chris Minnick is an accomplished author, trainer, and web developer who has worked on web and mobile projects for both small and major businesses. Eva Holland is an experienced writer and trainer who has designed and taught online, in-person, and video courses. They are cofounders of WatzThis?

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