{"id":22898,"date":"2018-10-08T16:15:56","date_gmt":"2018-10-08T13:15:56","guid":{"rendered":"http:\/\/www.webcodegeeks.com\/?p=22898"},"modified":"2018-10-07T12:29:22","modified_gmt":"2018-10-07T09:29:22","slug":"javascript-array-map-example","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/javascript-array-map-example\/","title":{"rendered":"JavaScript Array map() Example"},"content":{"rendered":"<p>Greetings readers, in this tutorial, we will show how to use the JavaScript scripting language and the JavaScript Array <code>map()<\/code> method.<\/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. It is supported by most web browsers including Google Chrome, Mozilla Firefox, Safari, Internet Explorer, Microsoft Edge, Opera, etc. 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<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<p>[ulp id=&#8217;tCIwOngQUb3zSUuF&#8217;]<\/p>\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>No support for networking applications<\/li>\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<h2>1.3 JavaScript Array map() Function<\/h2>\n<p>In Javascript scripting language, the <code>map()<\/code> function creates a new array with the results of calling a specified function on every array element. This function does not change the original array and returns the created array. Over here represents the simple syntax to practice this method.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>Snippet<\/em><\/span><\/p>\n<pre class=\"brush:js; wrap-lines:false;\">array.map(function(currentValue, index, arr), thisValue)<\/pre>\n<p>Where,<\/p>\n<ul>\n<li><code>function(currentValue, index, arr)<\/code> is a required parameter. This function executes for each element in the array<\/li>\n<li><code>thisValue<\/code> is an optional value passed to the function to be used as <code>this<\/code> value<\/li>\n<\/ul>\n<p>These new APIs make a developer life easier, really! But it would be difficult for a beginner to understand this without an example. Therefore, let us create a simple application using the JavaScript scripting language.<\/p>\n<h2>2. JavaScript Array map() 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<figure id=\"attachment_22899\" aria-describedby=\"caption-attachment-22899\" style=\"width: 272px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_structure_guide_1.jpg\"><img decoding=\"async\" class=\"wp-image-22899 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_structure_guide_1.jpg\" alt=\"JavaScript Array map() - Application Project Structure\" width=\"272\" height=\"269\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_structure_guide_1.jpg 272w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_structure_guide_1-70x70.jpg 70w\" sizes=\"(max-width: 272px) 100vw, 272px\" \/><\/a><figcaption id=\"caption-attachment-22899\" class=\"wp-caption-text\">Fig. 1: Application Project Structure<\/figcaption><\/figure>\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<figure id=\"attachment_22900\" aria-describedby=\"caption-attachment-22900\" style=\"width: 657px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_1.jpg\"><img decoding=\"async\" class=\"wp-image-22900 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_1.jpg\" alt=\"JavaScript Array map() - Create a Maven Project\" width=\"657\" height=\"690\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_1.jpg 657w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_1-286x300.jpg 286w\" sizes=\"(max-width: 657px) 100vw, 657px\" \/><\/a><figcaption id=\"caption-attachment-22900\" class=\"wp-caption-text\">Fig. 2: Create a Maven Project<\/figcaption><\/figure>\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<figure id=\"attachment_22901\" aria-describedby=\"caption-attachment-22901\" style=\"width: 598px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_2.jpg\"><img decoding=\"async\" class=\"wp-image-22901 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_2.jpg\" alt=\"JavaScript Array map() - Project Details\" width=\"598\" height=\"543\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_2.jpg 598w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_2-300x272.jpg 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><\/a><figcaption id=\"caption-attachment-22901\" class=\"wp-caption-text\">Fig. 3: Project Details<\/figcaption><\/figure>\n<p>Select the &#8216;Maven Web App&#8217; Archetype from the list of options and click next.<\/p>\n<figure id=\"attachment_22902\" aria-describedby=\"caption-attachment-22902\" style=\"width: 515px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_3.jpg\"><img decoding=\"async\" class=\"wp-image-22902 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_3.jpg\" alt=\"JavaScript Array map() - Archetype Selection\" width=\"515\" height=\"541\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_3.jpg 515w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_3-286x300.jpg 286w\" sizes=\"(max-width: 515px) 100vw, 515px\" \/><\/a><figcaption id=\"caption-attachment-22902\" class=\"wp-caption-text\">Fig. 4: Archetype Selection<\/figcaption><\/figure>\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<figure id=\"attachment_22903\" aria-describedby=\"caption-attachment-22903\" style=\"width: 597px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_4.jpg\"><img decoding=\"async\" class=\"wp-image-22903 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_4.jpg\" alt=\"JavaScript Array map() - Archetype Parameters\" width=\"597\" height=\"538\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_4.jpg 597w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_guide_4-300x270.jpg 300w\" sizes=\"(max-width: 597px) 100vw, 597px\" \/><\/a><figcaption id=\"caption-attachment-22903\" class=\"wp-caption-text\">Fig. 5: Archetype Parameters<\/figcaption><\/figure>\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;\r\n\t&lt;modelVersion&gt;4.0.0&lt;\/modelVersion&gt;\r\n\t&lt;groupId&gt; com.javascript&lt;\/groupId&gt;\r\n\t&lt;artifactId&gt;JavaScriptArrayMap&lt;\/artifactId&gt;\r\n\t&lt;version&gt;0.0.1-SNAPSHOT&lt;\/version&gt;\r\n\t&lt;packaging&gt;war&lt;\/packaging&gt;\r\n&lt;\/project&gt;\r\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>JavaScriptArrayMap\/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 Array Map Example ------&gt;\r\n&lt;h5&gt;Click the button to get multiply every element in the array with a specific number.&lt;\/h5&gt;\r\n&lt;div id=\"form\" class=\"form-inline\"&gt;\r\n\t&lt;div class=\"form-group mb-2\"&gt;\r\n\t\t&lt;label for=\"multiplyWith\" class=\"col-form-label\"&gt;Multiply with: &lt;\/label&gt;\r\n\t\t&lt;input type=\"number\" class=\"form-control\" id=\"multiplyWith\" value=\"5\" \/&gt;\r\n\t&lt;\/div&gt;\r\n\t&lt;button type=\"submit\" class=\"btn btn-primary mb-2\" onclick=\"multiply();\"&gt;Try it&lt;\/button&gt;\r\n&lt;\/div&gt;\r\n&lt;div&gt;\u00a0&lt;\/div&gt;\r\n\r\n&lt;div id=\"demo\"&gt;\r\n\t&lt;p&gt;&lt;strong&gt;New array: &lt;\/strong&gt;&lt;span id=\"myresult\"&gt;&lt;\/span&gt;&lt;\/p&gt;\r\n&lt;\/div&gt;\r\n<\/pre>\n<h3>3.2 Define the JavaScript function<\/h3>\n<p>Let us write a simple javascript function that multiplies all the values in an array with a given number. 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;\">var numbers = [30, 85, 10, 6];\r\n\r\nfunction multiplyArrayEle(num) {\r\n\treturn num * document.getElementById(\"multiplyWith\").value;\r\n}\r\n\r\nfunction multiply() {\r\n\tdocument.getElementById(\"myresult\").innerHTML = numbers.map(multiplyArrayEle);\r\n}\r\n<\/pre>\n<h3>3.3 First application<\/h3>\n<p>Complete the above steps and save the file. Let\u2019s 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 PUBLIC \"-\/\/W3C\/\/DTD HTML 4.01 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/html4\/loose.dtd\"&gt;\r\n&lt;html&gt;\r\n\t&lt;head&gt;\r\n\t    &lt;meta http-equiv=\"Content-Type\" content=\"text\/html; charset=ISO-8859-1\"&gt;\r\n\t    &lt;title&gt;IndexPage&lt;\/title&gt;\r\n\t    \r\n\t    &lt;link rel=\"stylesheet\" href=\"https:\/\/maxcdn.bootstrapcdn.com\/bootstrap\/3.3.7\/css\/bootstrap.min.css\"&gt;\r\n\r\n\t    &lt;script type=\"text\/javascript\"&gt;\r\n\t\t    var numbers = [30, 85, 10, 6];\r\n\t\t    \r\n\t\t    function multiplyArrayEle(num) {\r\n\t\t        return num * document.getElementById(\"multiplyWith\").value;\r\n\t\t    }\r\n\t\r\n\t\t    function multiply() {\r\n\t\t        document.getElementById(\"myresult\").innerHTML = numbers.map(multiplyArrayEle);\r\n\t\t    }\r\n\t    &lt;\/script&gt;\r\n\t&lt;\/head&gt;\r\n\t&lt;body&gt;\r\n\t\t&lt;div class=\"container\"&gt;\r\n\t\t\t&lt;h2 align=\"center\" class=\"text-primary\"&gt;JavaScript Array Map Example&lt;\/h2&gt;\r\n\t\t    &lt;hr \/&gt;\r\n\t\t    \r\n\t\t    &lt;!------ JavaScript Array Map Example ------&gt;\r\n\t\t    &lt;h5&gt;Click the button to get multiply every element in the array with a specific number.&lt;\/h5&gt;\r\n\t\t    &lt;div id=\"form\" class=\"form-inline\"&gt;\r\n\t\t    \t&lt;div class=\"form-group mb-2\"&gt;\r\n\t\t    \t\t&lt;label for=\"multiplyWith\" class=\"col-form-label\"&gt;Multiply with: &lt;\/label&gt;\r\n\t\t\t\t    &lt;input type=\"number\" class=\"form-control\" id=\"multiplyWith\" value=\"5\" \/&gt;\r\n\t\t    \t&lt;\/div&gt;\r\n\t\t    \t&lt;button type=\"submit\" class=\"btn btn-primary mb-2\" onclick=\"multiply();\"&gt;Try it&lt;\/button&gt;\r\n\t\t    &lt;\/div&gt;\r\n\t\t    &lt;div&gt;\u00a0&lt;\/div&gt;\r\n\t\t    \r\n\t\t    &lt;div id=\"demo\"&gt;\r\n\t\t    \t&lt;p&gt;&lt;strong&gt;New array: &lt;\/strong&gt;&lt;span id=\"myresult\"&gt;&lt;\/span&gt;&lt;\/p&gt;\r\n\t\t    &lt;\/div&gt;\r\n\t\t&lt;\/div&gt;\t    \r\n\t&lt;\/body&gt;\r\n&lt;\/html&gt;\r\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<figure id=\"attachment_22904\" aria-describedby=\"caption-attachment-22904\" style=\"width: 782px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_structure_deploy_guide_1.jpg\"><img decoding=\"async\" class=\"wp-image-22904 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_structure_deploy_guide_1.jpg\" alt=\"JavaScript Array map() - Deploy Application on Tomcat\" width=\"782\" height=\"426\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_structure_deploy_guide_1.jpg 782w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_structure_deploy_guide_1-300x163.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_structure_deploy_guide_1-768x418.jpg 768w\" sizes=\"(max-width: 782px) 100vw, 782px\" \/><\/a><figcaption id=\"caption-attachment-22904\" class=\"wp-caption-text\">Fig. 6: How to Deploy Application on Tomcat<\/figcaption><\/figure>\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\/JavaScriptArrayMap\/<\/pre>\n<p>Server name (localhost) and port (8082) may vary as per your Tomcat configuration.<\/p>\n<figure id=\"attachment_22905\" aria-describedby=\"caption-attachment-22905\" style=\"width: 814px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_demo_guide_1.jpg\"><img decoding=\"async\" class=\"wp-image-22905 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_demo_guide_1.jpg\" alt=\"JavaScript Array map() - Index page\" width=\"814\" height=\"162\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_demo_guide_1.jpg 814w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_demo_guide_1-300x60.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_demo_guide_1-768x153.jpg 768w\" sizes=\"(max-width: 814px) 100vw, 814px\" \/><\/a><figcaption id=\"caption-attachment-22905\" class=\"wp-caption-text\">Fig. 7: Index page<\/figcaption><\/figure>\n<p>Users can click the button to display the result of the newly created array as shown in Fig. 8.<\/p>\n<figure id=\"attachment_22906\" aria-describedby=\"caption-attachment-22906\" style=\"width: 817px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_demo_guide_2.jpg\"><img decoding=\"async\" class=\"wp-image-22906 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_demo_guide_2.jpg\" alt=\"JavaScript Array map() - Output\" width=\"817\" height=\"163\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_demo_guide_2.jpg 817w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_demo_guide_2-300x60.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/js_ex_project_demo_guide_2-768x153.jpg 768w\" sizes=\"(max-width: 817px) 100vw, 817px\" \/><\/a><figcaption id=\"caption-attachment-22906\" class=\"wp-caption-text\">Fig. 8: Output<\/figcaption><\/figure>\n<p>That is all for this tutorial and I hope the article served you whatever you were looking for. Happy Learning and don\u2019t 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 an example of JavaScript Array map() for the beginners.<\/p>\n<div class=\"download\"><strong>Download<\/strong><br \/>\nYou can download the full source code of this example here: <a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/10\/JavaScriptArrayMap.zip\" target=\"_blank\" rel=\"noopener\"><strong>JavaScriptArrayMap<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Greetings readers, in this tutorial, we will show how to use the JavaScript scripting language and the JavaScript Array map() method. 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. It is supported by most web browsers including Google Chrome, Mozilla &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-22898","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 Array map() 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 Array map()! 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