{"id":95677,"date":"2022-10-01T13:06:08","date_gmt":"2022-10-01T11:06:08","guid":{"rendered":"https:\/\/rmarketingdigital.com\/javascript\/que-variables-y-tipos-de-variables-usa-javascript\/"},"modified":"2020-12-06T11:45:56","modified_gmt":"2020-12-06T14:45:56","slug":"que-variables-y-tipos-de-variables-usa-javascript","status":"publish","type":"post","link":"https:\/\/rmarketingdigital.com\/en\/javascript\/que-variables-y-tipos-de-variables-usa-javascript\/","title":{"rendered":"What variables and types of variables does JavaScript use?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/rmarketingdigital.com\/en\/javascript\/que-variables-y-tipos-de-variables-usa-javascript\/#%C2%BFQue-es-una-variable\" >What is a variable?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/rmarketingdigital.com\/en\/javascript\/que-variables-y-tipos-de-variables-usa-javascript\/#Usar-la-palabra-clave-var-en-lugar-de-la-palabra-clave-let\" >Use the var keyword instead of the let keyword<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/rmarketingdigital.com\/en\/javascript\/que-variables-y-tipos-de-variables-usa-javascript\/#%C2%BFComo-nombrar-una-variable\" >How to name a variable?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/rmarketingdigital.com\/en\/javascript\/que-variables-y-tipos-de-variables-usa-javascript\/#Nombres-reservados-en-JS\" >Reserved names in JS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/rmarketingdigital.com\/en\/javascript\/que-variables-y-tipos-de-variables-usa-javascript\/#Nombra-bien-las-variables\" >Name the variables well<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<div itemprop=\"articleBody\">\n<p>In many cases it is necessary to develop an application in JavaScript that works and manipulates information, such as: we can create an online store that <span id=\"more-20\"\/>It can include information on products sold and even a shopping cart. Or we can also design a chat app that handles information such as users, messages, among others.<\/p>\n<p>This is where variables come into play, since we are going to use them to hold information or content in them.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-una-variable\"><\/span>What is a variable?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A variable is a special storage space that we can name according to the rules that JS has for this process. In them we can save data such as numbers, text strings, number of visitors, among others. The limits are defined by you.<\/p>\n<p>To create a variable you need to use the keyword <strong>let<\/strong>.<\/p>\n<p>In the following code I show you how to declare a variable called message.<\/p>\n<p><code data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let message;<\/code><\/p>\n<p>If we use the assignment operator (\u00a0<strong>=\u00a0<\/strong>), we can assign values to it.<\/p>\n<pre data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let message; message = &#039;Hello!&#039;; \/\/ Here we are saving this text string in the message variable\n<\/pre>\n<p>The srting or string is now stored in the memory area associated with the message variable. We can access it using the name we assign to the variable:<\/p>\n<pre data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let message; message = &#039;Hello!&#039;; alert (message); \/\/ With this we make an alert that shows the variable content\n<\/pre>\n<p>To be specific, we can combine the declaration and the variable assignment in one line:<\/p>\n<pre data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let message = &#039;Hello!&#039;; \/\/ Here we define the variable and assign the value alert (message); \/\/ Hi!\n<\/pre>\n<p>We can also declare multiple variables on one line if we separate them by commas. Example:<\/p>\n<p><code data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let user = &#039;Juan&#039;, age = 25, message = &#039;Hello&#039;;<\/code><\/p>\n<p>The above example may seem shorter, but it is not the most recommended. For better reading, use a single line per declared variable.<\/p>\n<p>The multi-line variant may be a bit longer, but it is easier to read:<\/p>\n<pre data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let user = &#039;Juan&#039;; let age = 25; let message = &#039;Hello&#039;;\n<\/pre>\n<p>Some programmers also write many variables like this:<\/p>\n<pre data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let user = &#039;John&#039;, age = 25, message = &#039;Hello&#039;;\n<\/pre>\n<p>Or they even promote the &quot;comma first&quot; style:<\/p>\n<pre data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let user = &#039;John&#039;, age = 25, message = &#039;Hello&#039;;\n<\/pre>\n<p>Technically, all of these variants do the same. Therefore, it is a matter of personal taste and aesthetics.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Usar-la-palabra-clave-var-en-lugar-de-la-palabra-clave-let\"><\/span>Use the var keyword instead of the let keyword<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In previous scripts you can also find another keyword: named<strong> var<\/strong> instead of the one we use in the examples with <strong>let<\/strong>:<\/p>\n<p><code data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">var message = &#039;Hello!&#039;;\u00a0<\/code><\/p>\n<p>The key word\u00a0<strong>var<\/strong> is almost the same as the keyword\u00a0<strong>let<\/strong>. It can also be used to declare a variable, but in a slightly different, &quot;old-school&quot; way.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%C2%BFComo-nombrar-una-variable\"><\/span>How to name a variable?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can give almost any name to a variable, however, you must follow two basic guidelines:<\/p>\n<ol>\n<li>The variable name must contain only letters, numbers, and \/ or symbols <strong>$\u00a0<\/strong>and<strong> _<\/strong>.<\/li>\n<li>No variable name must begin with a number.<\/li>\n<\/ol>\n<p>Here are some valid variable names:<\/p>\n<pre data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let User_Name; let The_best_01$;\n<\/pre>\n<p>When the name contains multiple words, a practice called<em> camelCase<\/em> . That is to say: the words go one after another, and each word begins with a capital letter: <strong>This would be a very long name.<\/strong><\/p>\n<p>Another interesting fact is that the dollar sign<strong> &#039;$&#039;<\/strong>and the underscore <strong>&#039;_&#039;\u00a0<\/strong>they can also be used in variable names or as variable names. They are regular symbols, just like letters, without any special meaning.<\/p>\n<p>These names are also valid:<\/p>\n<pre data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let $ = 4; \/\/ declare a variable with the name &quot;$&quot; let _ = 5; \/\/ and now a variable with the name &quot;_&quot; alert ($ + _); \/\/ 9\n<\/pre>\n<p>However, these are variable names <strong>totally wrong<\/strong>:<\/p>\n<pre data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let 26mj; \/\/ cannot start with a digit let my-User; \/\/ a dash &#039;-&#039; is not allowed in the name\n<\/pre>\n<p><strong>Note:<\/strong> The use of upper and lower case does matter. This means that the variable <strong>User<\/strong> is totally different from the variable <strong>user.<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Nombres-reservados-en-JS\"><\/span>Reserved names in JS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Surely you ask yourself &quot;What are reserved names?&quot; Well, it is simply a list of reserved words, which cannot be used as variable names, since they are used by the JavaScript language itself.<\/p>\n<p>For example, the words<strong> let<\/strong>, <strong>class<\/strong>,<strong> return<\/strong>, <strong>function<\/strong>, among others, are reserved. For the same reason, the following code will give you a syntax error:<\/p>\n<pre data-enlighter-language=\"php\" class=\"EnlighterJSRAW\">let return; \/\/ cannot name a variable &quot;return&quot;, error! let function; \/\/ can&#039;t call &quot;function&quot; either, error!\n<\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Nombra-bien-las-variables\"><\/span>Name the variables well<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Speaking of variables, there is one more thing that is extremely important.<\/p>\n<p>Please name the variables sensibly. Take the time to think if necessary.<\/p>\n<p>Naming variables is one of the most important and complex skills in programming. A quick look at the variable names can reveal which code is written by a beginner and which by an experienced developer.<\/p>\n<p>In a real project, most of the time is spent modifying and extending the existing code base, rather than writing something completely separate from scratch. And when we go back to the code after a while of doing something else, it is much easier to find information that is well labeled. Or, in other words, when variables have good names.<\/p>\n<p>Spend some time thinking about the correct name for a variable before declaring it. This will pay off a lot.<\/p>\n<p>Some good rules to follow are:<\/p>\n<ul>\n<li>Use human readable names like <strong>Username<\/strong> or <strong>Buyerof Items<\/strong>.<\/li>\n<li>Stay away from abbreviations or short names like <strong>to<\/strong>, <strong>b<\/strong>, or <strong>c<\/strong>, unless you really know what you are doing.<\/li>\n<li>Make the name maximum descriptive and concise. Examples of bad names are <strong>data\u00a0<\/strong>and <strong>values<\/strong>. Such names say nothing. It&#039;s only okay to use them if it&#039;s exceptionally obvious from the context of what data or values you&#039;re referring to.<\/li>\n<li>Agree on the terms within your team and in your own mind. If a visitor to the site is called a &quot;user&quot;, we should name related variables like <strong>User<\/strong>, <strong>new user<\/strong>, but no <strong>Visitor<\/strong> or <strong>New Individual<\/strong>.<\/li>\n<\/ul>\n<p>Sounds simple? Indeed it is, but creating good concise and descriptive names in practice is not. Go for it.<\/p>\n<\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>In many cases it is necessary to develop a JavaScript application that works and manipulates information, such as: we can create an online store that can include product information...<\/p>","protected":false},"author":1,"featured_media":95678,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1374],"tags":[],"class_list":["post-95677","post","type-post","status-publish","format-standard","has-post-thumbnail","category-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>\u00bfQu\u00e9 variables y tipos de variables usa JavaScript? - R Marketing Digital<\/title>\n<meta name=\"description\" content=\"En muchos casos es necesario desarrollar una aplicaci\u00f3n en JavaScript que trabaje y manipule informaci\u00f3n, como por ejemplo: podemos crear una tienda en\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rmarketingdigital.com\/en\/javascript\/que-variables-y-tipos-de-variables-usa-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00bfQu\u00e9 variables y tipos de variables usa JavaScript?\" \/>\n<meta property=\"og:description\" content=\"En muchos casos es necesario desarrollar una aplicaci\u00f3n en JavaScript que trabaje y manipule informaci\u00f3n, como por ejemplo: podemos crear una tienda en\" \/>\n<meta property=\"og:url\" content=\"https:\/\/rmarketingdigital.com\/en\/javascript\/que-variables-y-tipos-de-variables-usa-javascript\/\" \/>\n<meta property=\"og:site_name\" content=\"R Marketing Digital\" \/>\n<meta property=\"article:published_time\" content=\"2022-10-01T11:06:08+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/rmarketingdigital.com\/wp-content\/uploads\/2020\/12\/Diseno-sin-titulo-12-4427843.png\" \/>\n\t<meta property=\"og:image:width\" content=\"810\" \/>\n\t<meta property=\"og:image:height\" content=\"450\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"R Marketing Digital\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/rmarketingdigital.com\\\/javascript\\\/que-variables-y-tipos-de-variables-usa-javascript\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/rmarketingdigital.com\\\/javascript\\\/que-variables-y-tipos-de-variables-usa-javascript\\\/\"},\"author\":{\"name\":\"R Marketing Digital\",\"@id\":\"https:\\\/\\\/rmarketingdigital.com\\\/#\\\/schema\\\/person\\\/7c0d9782b2977b840b3740f00c69a73e\"},\"headline\":\"\u00bfQu\u00e9 variables y tipos de variables usa JavaScript?\",\"datePublished\":\"2022-10-01T11:06:08+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/rmarketingdigital.com\\\/javascript\\\/que-variables-y-tipos-de-variables-usa-javascript\\\/\"},\"wordCount\":927,\"image\":{\"@id\":\"https:\\\/\\\/rmarketingdigital.com\\\/javascript\\\/que-variables-y-tipos-de-variables-usa-javascript\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/rmarketingdigital.com\\\/wp-content\\\/uploads\\\/2020\\\/12\\\/Diseno-sin-titulo-12-4427843.png\",\"articleSection\":[\"Javascript\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/rmarketingdigital.com\\\/javascript\\\/que-variables-y-tipos-de-variables-usa-javascript\\\/\",\"url\":\"https:\\\/\\\/rmarketingdigital.com\\\/javascript\\\/que-variables-y-tipos-de-variables-usa-javascript\\\/\",\"name\":\"\u00bfQu\u00e9 variables y tipos de variables usa JavaScript? 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