{"id":858,"date":"2017-11-06T14:13:51","date_gmt":"2017-11-06T14:13:51","guid":{"rendered":"https:\/\/code-projects.org\/?p=858"},"modified":"2018-04-24T15:39:09","modified_gmt":"2018-04-24T15:39:09","slug":"variables-javascript-basics","status":"publish","type":"post","link":"https:\/\/code-projects.org\/variables-javascript-basics\/","title":{"rendered":"Variables &#8211; JavaScript Basics"},"content":{"rendered":"<p>Variables are the packages for storing the values. Lets take an example, suppose a,b,c are variables :<\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;body&gt;\r\n\r\n&lt;h1&gt;JS Variables&lt;\/h1&gt;\r\n&lt;p&gt; (a, b &amp; c are variables!!) &lt;\/p&gt;\r\n&lt;p id=\"ex\"&gt;&lt;\/p&gt;\r\n\r\n&lt;script&gt;\r\nvar a = 10;\r\nvar b = 20;\r\nvar c = a + b;\r\ndocument.getElementById(\"ex\").innerHTML =\r\n\"Value Of C is = \" + c;\r\n&lt;\/script&gt;\r\n\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<p><strong>Output :<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-859 alignleft\" src=\"https:\/\/code-projects.org\/wp-content\/uploads\/2017\/11\/Screenshot-842.png\" alt=\"\" width=\"244\" height=\"168\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><em><strong>JS Identifiers<\/strong><\/em><\/p>\n<p>With\u00a0unique names all the JS variables should be identified. And these Unique names are known as Identifiers, it\u00a0can be short name (like a and b) or more descriptive names (age, sum, totalVolume).<\/p>\n<ol>\n<li>Reserved words can&#8217;t be used as names.<\/li>\n<li>Names can contain digits, letters, dollar signs, and underscore.<\/li>\n<li>Names must begin with a letter<\/li>\n<li>Names are case sensitive (a &amp; A are different variables)<\/li>\n<li>Names can also begin with( $ ) and ( _ )<\/li>\n<\/ol>\n<p><em><strong>Data Types<\/strong><\/em><\/p>\n<p>JS handles many types of data, for now lets just think of strings &amp; numbers. Inside double or single quotation (&#8221; &#8221; or &#8216; &#8216; ) Strings are written and numbers are written without quotation. If numbers are kept in a quotation mark then it will be read as a Text!!<\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;body&gt;\r\n\r\n&lt;h1&gt;JS Variables&lt;\/h1&gt;\r\n&lt;p&gt;Strings are written inside Quotation sign &amp; Numbers are written without it!&lt;\/p&gt;\r\n&lt;p id=\"ex\"&gt;&lt;\/p&gt;\r\n\r\n&lt;script&gt;\r\nvar pi = 2.22;\r\nvar person = \"Code Projects\";\r\nvar answer = 'Projects, Tutorials &amp; More. . ';\r\n\r\ndocument.getElementById(\"ex\").innerHTML =\r\npi + \"&lt;br&gt;\" + person + \"&lt;br&gt;\" + answer;\r\n&lt;\/script&gt;\r\n\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<p><strong>Output :<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-860 alignleft\" src=\"https:\/\/code-projects.org\/wp-content\/uploads\/2017\/11\/Screenshot-843.png\" alt=\"\" width=\"499\" height=\"186\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><em><strong>Creating Variables<\/strong><\/em><\/p>\n<p>You can simply create a variable with\u00a0<b>var<\/b>\u00a0keyword.<\/p>\n<pre>var Name;<\/pre>\n<p>It has no value; its undefined. ( = ) sign is used to allow value to variable.<\/p>\n<pre>var Name = \"Johnny\";\r\n\r\nName = \"Johnny\";<\/pre>\n<p>Now Let&#8217;s take an example :<\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;body&gt;\r\n\r\n&lt;h1&gt;JS Variables&lt;\/h1&gt;\r\n&lt;p&gt;Create a variable and then put the value!&lt;\/p&gt;\r\n&lt;p id=\"ex\"&gt;&lt;\/p&gt;\r\n\r\n&lt;script&gt;\r\nvar Name = \"Johnny\";\r\ndocument.getElementById(\"ex\").innerHTML = Name;\r\n&lt;\/script&gt;\r\n\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<p><strong>Output :<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-861 alignleft\" src=\"https:\/\/code-projects.org\/wp-content\/uploads\/2017\/11\/Screenshot-844.png\" alt=\"\" width=\"310\" height=\"168\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><em><strong>Many Variables in One Statement<\/strong><\/em><\/p>\n<p>You can simply create many variables in one statement.<\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;body&gt;\r\n\r\n&lt;h1&gt;JS Variables&lt;\/h1&gt;\r\n&lt;p&gt;Create many variables in one statement!&lt;\/p&gt;\r\n&lt;p id=\"ex\"&gt;&lt;\/p&gt;\r\n\r\n&lt;script&gt;\r\nvar person = \"Johnny\", bikeName = \"Yamaha\", price = 300000;\r\ndocument.getElementById(\"ex\").innerHTML = bikeName;\r\n&lt;\/script&gt;\r\n\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<p><strong>Output :<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-862 alignleft\" src=\"https:\/\/code-projects.org\/wp-content\/uploads\/2017\/11\/Screenshot-845.png\" alt=\"\" width=\"304\" height=\"167\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><em><strong>Undefined Value<\/strong><\/em><\/p>\n<p>Variable created without a value will have\u00a0undefined value<b>.\u00a0<\/b>Lets take an example of variable bikeName which will have undefined value!<\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;body&gt;\r\n\r\n&lt;h1&gt;JS Variables&lt;\/h1&gt;\r\n&lt;p&gt;Variables created without value will have undefined value!&lt;\/p&gt;\r\n&lt;p id=\"ex\"&gt;&lt;\/p&gt;\r\n\r\n&lt;script&gt;\r\nvar bikeName;\r\ndocument.getElementById(\"ex\").innerHTML = bikeName;\r\n&lt;\/script&gt;\r\n\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<p><strong>Output :<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-863 alignleft\" src=\"https:\/\/code-projects.org\/wp-content\/uploads\/2017\/11\/Screenshot-846.png\" alt=\"\" width=\"417\" height=\"167\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><em><strong>Re-Creating Variables<\/strong><\/em><\/p>\n<p>You will not lose its value if you are re-creating same variable!<\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;body&gt;\r\n\r\n&lt;h1&gt;JS Variables&lt;\/h1&gt;\r\n&lt;p&gt;Values wont erase if you are recreating same variable&lt;\/p&gt;\r\n&lt;p id=\"ex\"&gt;&lt;\/p&gt;\r\n\r\n&lt;script&gt;\r\nvar bikeName = \"Yamaha\";\r\nvar bikeName;\r\ndocument.getElementById(\"ex\").innerHTML = bikeName;\r\n&lt;\/script&gt;\r\n\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<p><strong>Output :<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-864 alignleft\" src=\"https:\/\/code-projects.org\/wp-content\/uploads\/2017\/11\/Screenshot-847.png\" alt=\"\" width=\"366\" height=\"167\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><em><strong>Arithmetic<\/strong><\/em><\/p>\n<p>Using operators like ( = ) and ( + ) you can perform arithmetic operations here:<\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;body&gt;\r\n\r\n&lt;h1&gt;JS Variables&lt;\/h1&gt;\r\n&lt;p&gt;Adding 50 + 12 + 22 &lt;\/p&gt;\r\n&lt;p id=\"ex\"&gt;&lt;\/p&gt;\r\n\r\n&lt;script&gt;\r\nvar a = 50 + 12 + 22;\r\ndocument.getElementById(\"ex\").innerHTML = a;\r\n&lt;\/script&gt;\r\n\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<p><strong>Output :<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-865 alignleft\" src=\"https:\/\/code-projects.org\/wp-content\/uploads\/2017\/11\/Screenshot-848.png\" alt=\"\" width=\"229\" height=\"154\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>To Add Strings :<\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;body&gt;\r\n\r\n&lt;h1&gt;JS Variables&lt;\/h1&gt;\r\n&lt;p&gt;Adding Code + Projects &lt;\/p&gt;\r\n&lt;p id=\"ex\"&gt;&lt;\/p&gt;\r\n\r\n&lt;script&gt;\r\nvar a = \"Code\" + \" \" + \"Projects\";\r\ndocument.getElementById(\"ex\").innerHTML = a;\r\n&lt;\/script&gt;\r\n\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<p><strong>Output :<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-866 alignleft\" src=\"https:\/\/code-projects.org\/wp-content\/uploads\/2017\/11\/Screenshot-850.png\" alt=\"\" width=\"215\" height=\"168\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Variables are the packages for storing the values. Lets take an example, suppose a,b,c are variables : &lt;!DOCTYPE html&gt; &lt;html&gt; [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":36151,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","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-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":"","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-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":"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":""},"mobile":{"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":""}},"footnotes":""},"categories":[4,216],"tags":[272],"post_format":[],"class_list":["post-858","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorial","category-jstutorial","tag-javascript-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Variables - JavaScript Basics - Source Code &amp; Projects<\/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:\/\/code-projects.org\/variables-javascript-basics\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Variables - JavaScript Basics - Source Code &amp; Projects\" \/>\n<meta property=\"og:description\" content=\"Variables are the packages for storing the values. 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