{"id":23412,"date":"2019-01-07T16:15:52","date_gmt":"2019-01-07T14:15:52","guid":{"rendered":"http:\/\/www.webcodegeeks.com\/?p=23412"},"modified":"2019-01-04T15:38:53","modified_gmt":"2019-01-04T13:38:53","slug":"javascript-string-includes-example","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/javascript-string-includes-example\/","title":{"rendered":"JavaScript String includes() Example"},"content":{"rendered":"<p>Greetings readers, in this tutorial, we will understand the <code>includes()<\/code> method in the JavaScript language.<\/p>\n<h2>1. Introduction<\/h2>\n<p><strong>JavaScript<\/strong> is an object-oriented programming language that allows the <em>client-side scripting<\/em> to interact with a user and deliver the dynamic pages. Most web browsers including Google Chrome, Mozilla Firefox, Safari, Internet Explorer, Microsoft Edge, Opera, etc. support it. The JavaScript scripting language includes:<\/p>\n<ul>\n<li>Declaring variables<\/li>\n<li>Maintaining the retrieving values<\/li>\n<li>Defining and invoking functions<\/li>\n<li>Defining classes<\/li>\n<li>Load and use external modules<\/li>\n<li>Define event handlers<\/li>\n<li>And much more \u2026.<\/li>\n<\/ul>\n<p>[ulp id=&#8217;tCIwOngQUb3zSUuF&#8217;]<\/p>\n<h3>1.1 Advantages of JavaScript Language<\/h3>\n<p>The pros of using the JavaScript scripting language are:<\/p>\n<ul>\n<li>JavaScript is easy to learn<\/li>\n<li>It executes on client&#8217;s browser, so eliminates the server-side processing and be executed on any OS<\/li>\n<li>JavaScript can be used with any type of web page e.g. PHP, ASP.NET, Perl etc<\/li>\n<li>Web-page performance increases due to client-side execution<\/li>\n<li>JavaScript code can be minified to decrease the loading time from the server<\/li>\n<li>Many JavaScript-based application frameworks are available in the market to create Single page web applications e.g. AngularJS, ReactJS etc.<\/li>\n<\/ul>\n<h3>1.2 Disadvantages of JavaScript Language<\/h3>\n<p>The cons of using the JavaScript scripting language are:<\/p>\n<ul>\n<li>Does not have any multi-threading or multi-processing capabilities<\/li>\n<li>Does not allow the file reading and writing capabilities<\/li>\n<\/ul>\n<h3>1.3 JavaScript String includes() Method<\/h3>\n<p>The <code>includes()<\/code> method determines whether a string contains the characters of a given string or not. The method returns <code>true<\/code> if the condition is met, otherwise, it will return <code>false<\/code>. The method has the following syntax.<\/p>\n<pre class=\"brush:js; wrap-lines:false;\">myString.includes(searchValue, startIndex);<\/pre>\n<p>Where,<\/p>\n<ul>\n<li>The <code>searchValue<\/code> is a required String parameter in which the search operation will take place<\/li>\n<li>The <code>startIndex<\/code> is an optional Integer parameter (i.e. positioning parameter) at which the search operation will start. The default value of this parameter is zero<\/li>\n<\/ul>\n<p>Do <em>note<\/em>, this method is case sensitive in nature i.e. it treats the uppercase and lowercase characters differently.<\/p>\n<h2>2. JavaScript String includes() Example<\/h2>\n<p>Here is a systematic guide for implementing this tutorial using the JavaScript language.<\/p>\n<h3>2.1 Tools Used<\/h3>\n<p>We are using Eclipse Kepler SR2, JDK 8 and Maven. Having said that, we have tested the code against JDK 1.7 and it works well.<\/p>\n<h3>2.2 Project Structure<\/h3>\n<p>Firstly, let us review the final project structure if you are confused about where you should create the corresponding files or folder later!<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"604\" height=\"447\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project_structure-guide-img-1.jpg\" alt=\"JavaScript String includes() - Application Project Structure\" class=\"wp-image-23413\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project_structure-guide-img-1.jpg 604w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project_structure-guide-img-1-300x222.jpg 300w\" sizes=\"(max-width: 604px) 100vw, 604px\" \/><figcaption>Fig. 1: Application Project Structure<\/figcaption><\/figure><\/div>\n\n\n<h3>2.3 Project Creation<\/h3>\n<p>This section will show on how to create a Java-based Maven project with Eclipse. In Eclipse Ide, go to <code>File -&gt; New -&gt; Maven Project<\/code>.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"657\" height=\"690\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_1.jpg\" alt=\"JavaScript String includes() - Create a Maven Project\" class=\"wp-image-23414\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_1.jpg 657w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_1-286x300.jpg 286w\" sizes=\"(max-width: 657px) 100vw, 657px\" \/><figcaption>Fig. 2: Create a Maven Project<\/figcaption><\/figure><\/div>\n\n\n<p>In the New Maven Project window, it will ask you to select the project location. By default, &#8216;Use default workspace location&#8217; will be selected. Just click on the next button to proceed.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"598\" height=\"543\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_2.jpg\" alt=\"JavaScript String includes() - Project Details\" class=\"wp-image-23415\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_2.jpg 598w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_2-300x272.jpg 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><figcaption>Fig. 3: Project Details<\/figcaption><\/figure><\/div>\n\n\n<p>Select the &#8216;Maven Web App&#8217; Archetype from the list of options and click next.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"515\" height=\"541\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_3.jpg\" alt=\"JavaScript String includes() - Archetype Selection\" class=\"wp-image-23416\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_3.jpg 515w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_3-286x300.jpg 286w\" sizes=\"(max-width: 515px) 100vw, 515px\" \/><figcaption>Fig. 4: Archetype Selection<\/figcaption><\/figure><\/div>\n\n\n<p>It will ask you to &#8216;Enter the group and the artifact id for the project&#8217;. We will input the details as shown in the below image. The version number will be by default: <code>0.0.1-SNAPSHOT<\/code>.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"817\" height=\"747\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_4.jpg\" alt=\"JavaScript String includes() - Archetype Parameters\" class=\"wp-image-23417\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_4.jpg 817w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_4-300x274.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js_includes_project_guide_4-768x702.jpg 768w\" sizes=\"(max-width: 817px) 100vw, 817px\" \/><figcaption>Fig. 5: Archetype Parameters<\/figcaption><\/figure><\/div>\n\n\n<p>Click on Finish and the creation of a maven project is completed. If you see, it has downloaded the maven dependencies and a <code>pom.xml<\/code> file will be created. It will have the following code:<\/p>\n<p><span style=\"text-decoration: underline\"><em>pom.xml<\/em><\/span><\/p>\n<pre class=\"brush:xml; wrap-lines:false;\">&lt;project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\" xsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 http:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\"&gt;\n\t&lt;modelVersion&gt;4.0.0&lt;\/modelVersion&gt;\n\t&lt;groupId&gt;com.javascript&lt;\/groupId&gt;\n\t&lt;artifactId&gt;JavascriptStringIncludes&lt;\/artifactId&gt;\n\t&lt;version&gt;0.0.1-SNAPSHOT&lt;\/version&gt;\n\t&lt;packaging&gt;war&lt;\/packaging&gt;\n&lt;\/project&gt;\n<\/pre>\n<h2>3. Application Building<\/h2>\n<p>Let us create an application to understand the basic building blocks of this tutorial.<\/p>\n<h3>3.1 Define the HTML<\/h3>\n<p>Let us write a simple index page in the <code>JavascriptStringIncludes\/src\/main\/webapp\/<\/code> folder. Add the following code to it:<\/p>\n<p><span style=\"text-decoration: underline\"><em>index.jsp<\/em><\/span><\/p>\n<pre class=\"brush:html; wrap-lines:false;\">&lt;!-- Javascript String includes() method tutorial --&gt;\n&lt;div id=\"title\"&gt;\n\t&lt;h4 class=\"text-info\"&gt;Definition&lt;\/h4&gt;\n\t&lt;ul&gt;\n\t\t&lt;li&gt;Check whether a string contains the characters of a specified string.&lt;\/li&gt;\n\t\t&lt;li&gt;Returns &lt;code&gt;true&lt;\/code&gt; if the condition is matched, and &lt;code&gt;false&lt;\/code&gt; if not.&lt;\/li&gt;\n\t\t&lt;li&gt;Method is case-sensitive.&lt;\/li&gt;\n\t\t&lt;li&gt;Not supported in IE11 and earlier versions.&lt;\/li&gt;\n\t&lt;\/ul&gt;\n\t&lt;div&gt;&nbsp;&lt;\/div&gt;\n\t\n\t&lt;p&gt;&lt;small&gt;Click the button to check where if the string includes the specified value.&lt;\/small&gt;&lt;\/p&gt;\n\t&lt;button type=\"button\" class=\"btn btn-success\" onclick=\"validate();\"&gt;Try&lt;\/button&gt;\n\t&lt;div&gt;&nbsp;&lt;\/div&gt;\n\t\n\t&lt;div id=\"result\"&gt;&lt;\/div&gt;\n&lt;\/div&gt;\n<\/pre>\n<h3>3.2 Define the JavaScript function<\/h3>\n<p>Let us write a simple javascript function that will help developers understand the <code>includes()<\/code> method in the javascript language. Add the following code to it:<\/p>\n<p><span style=\"text-decoration: underline\"><em>JavaScript function<\/em><\/span><\/p>\n<pre class=\"brush:js; wrap-lines:false;\">\/\/ Javascript function.\nfunction validate() {\n\tvar mystr = \"Welcome to Web Code Geeks.\"; \n\tvar check = mystr.includes(\"Geeks\"); \n\tdocument.getElementById(\"result\").innerHTML = check;\n}\n<\/pre>\n<h3>3.3 First application<\/h3>\n<p>Complete the above steps and save the file. Let us see the sample code snippet.<\/p>\n<p><span style=\"text-decoration: underline\"><em>index.jsp<\/em><\/span><\/p>\n<pre class=\"brush: html; wrap-lines:false;\">&lt;!DOCTYPE html&gt;\n&lt;html lang=\"en\"&gt;\n\n&lt;head&gt;\n    &lt;title&gt;Index page&lt;\/title&gt;\n    &lt;meta http-equiv=\"Content-Type\" content=\"text\/html; charset=ISO-8859-1\"&gt;\n    &lt;link rel=\"stylesheet\" href=\"https:\/\/stackpath.bootstrapcdn.com\/bootstrap\/4.1.3\/css\/bootstrap.min.css\"&gt;\n&lt;\/head&gt;\n\n&lt;body&gt;\n    &lt;div class=\"container\"&gt;\n        &lt;h2 align=\"center\" class=\"text-danger\"&gt;String includes() method in JavaScript&lt;\/h2&gt;\n        &lt;hr \/&gt;\n\n        &lt;!-- Javascript String includes() method tutorial --&gt;\n        &lt;div id=\"title\"&gt;\n\t\t\t&lt;h4 class=\"text-info\"&gt;Definition&lt;\/h4&gt;\n\t\t\t&lt;ul&gt;\n\t\t\t\t&lt;li&gt;Check whether a string contains the characters of a specified string.&lt;\/li&gt;\n\t\t\t\t&lt;li&gt;Returns &lt;code&gt;true&lt;\/code&gt; if the condition is matched, and &lt;code&gt;false&lt;\/code&gt; if not.&lt;\/li&gt;\n\t\t\t\t&lt;li&gt;Method is case-sensitive.&lt;\/li&gt;\n\t\t\t\t&lt;li&gt;Not supported in IE11 and earlier versions.&lt;\/li&gt;\n\t\t\t&lt;\/ul&gt;\n\t\t\t&lt;div&gt;&nbsp;&lt;\/div&gt;\n\t\t\t\n\t\t\t&lt;p&gt;&lt;small&gt;Click the button to check where if the string includes the specified value.&lt;\/small&gt;&lt;\/p&gt;\n\t\t\t&lt;button type=\"button\" class=\"btn btn-success\" onclick=\"validate();\"&gt;Try&lt;\/button&gt;\n\t\t\t&lt;div&gt;&nbsp;&lt;\/div&gt;\n\t\t\t\n\t\t\t&lt;div id=\"result\"&gt;&lt;\/div&gt;\n        &lt;\/div&gt;\n    &lt;\/div&gt;\n    &lt;script&gt;\n\t\t\/\/ Javascript function.\n\t\tfunction validate() {\n\t\t\tvar mystr = \"Welcome to Web Code Geeks.\"; \n\t\t\tvar check = mystr.includes(\"Geeks\"); \n\t\t\tdocument.getElementById(\"result\").innerHTML = check;\n\t\t}\n    &lt;\/script&gt;\n&lt;\/body&gt;\n\n&lt;\/html&gt;\n<\/pre>\n<h2>4. Run the Application<\/h2>\n<p>As we are ready for all the changes, let us compile the project and deploy the application on the Tomcat7 server. To deploy the application on Tomat7, right-click on the project and navigate to <code>Run as -&gt; Run on Server<\/code>.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"818\" height=\"254\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project-deploy-guide-img-1.jpg\" alt=\"JavaScript String includes() - Deploy Application on Tomcat\" class=\"wp-image-23418\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project-deploy-guide-img-1.jpg 818w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project-deploy-guide-img-1-300x93.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project-deploy-guide-img-1-768x238.jpg 768w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><figcaption>Fig. 6: How to Deploy Application on Tomcat<\/figcaption><\/figure><\/div>\n\n\n<p>Tomcat will deploy the application in its web-apps folder and shall start its execution to deploy the project so that we can go ahead and test it in the browser.<\/p>\n<h2>5. Project Demo<\/h2>\n<p>Open your favorite browser and hit the following URL to display the application\u2019s index page as shown in Fig. 7.<\/p>\n<pre class=\"brush:plain; wrap-lines:false;\">http:\/\/localhost:8082\/JavascriptStringIncludes\/<\/pre>\n<p>Server name (localhost) and port (8082) may vary as per your Tomcat configuration.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"818\" height=\"239\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project-demo-guide-img-1.jpg\" alt=\"JavaScript String includes() - Index page\" class=\"wp-image-23419\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project-demo-guide-img-1.jpg 818w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project-demo-guide-img-1-300x88.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/js-string-project-demo-guide-img-1-768x224.jpg 768w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><figcaption>Fig. 7: Index page<\/figcaption><\/figure><\/div>\n\n\n<p>Users can click the button to display the result and can change the js function to debug the <code>includes()<\/code> method. That is all for this tutorial and I hope the article served you whatever you were looking for. Happy learning and do not forget to share.<\/p>\n<h2>6. Conclusion<\/h2>\n<p>In this section, developers learned how to create a simple application with the JavaScript language. Developers can download the sample application as an Eclipse project in the <a href=\"#projectDownload\">Downloads<\/a> section.<\/p>\n<h2><a name=\"projectDownload\"><\/a>7. Download the Eclipse Project<\/h2>\n<p>This was a beginner\u2019s tutorial to understand the String <code>includes()<\/code> method in the javascript language.<\/p>\n<div class=\"download\"><strong>Download<\/strong><br \/>You can download the full source code of this example here: <a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2019\/01\/JavascriptStringIncludes.zip\" target=\"_blank\" rel=\"noopener\"><strong>JavascriptStringIncludes<\/strong><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>Greetings readers, in this tutorial, we will understand the includes() method in the JavaScript language. 1. Introduction JavaScript is an object-oriented programming language that allows the client-side scripting to interact with a user and deliver the dynamic pages. Most web browsers including Google Chrome, Mozilla Firefox, Safari, Internet Explorer, Microsoft Edge, Opera, etc. support it. &hellip;<\/p>\n","protected":false},"author":2162,"featured_media":920,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[82],"class_list":["post-23412","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript String includes() Example - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Interested to learn more about JavaScript? Then check out our detailed example on JavaScript String includes()! 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