{"id":23342,"date":"2018-12-19T16:15:27","date_gmt":"2018-12-19T14:15:27","guid":{"rendered":"http:\/\/www.webcodegeeks.com\/?p=23342"},"modified":"2018-12-18T12:53:59","modified_gmt":"2018-12-18T10:53:59","slug":"javascript-iterators-example","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/javascript-iterators-example\/","title":{"rendered":"JavaScript Iterators Example"},"content":{"rendered":"<p>Greetings readers, in this tutorial, we will understand <strong>Iterators<\/strong> 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>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 Iterators in JavaScript Language<\/h2>\n<ul>\n<li>Introduced in ES6 to loop over any collection in javascript<\/li>\n<li>According to ES6, an <em>iterable<\/em> is a data structure that makes its elements accessible to the public. It is implemented by a method whose key is <code>Symbol.iterator<\/code><\/li>\n<li>The <code>Symbol.iterator<\/code> method returns an object (i.e. <em>Iterator<\/em>) with a method called <code>next()<\/code>, which assembles each value in the collection each time it gets called<\/li>\n<li>An <em>iterator<\/em> is a pointer for traversing the elements of a data structure<\/li>\n<li><code>Array<\/code>, <code>String<\/code>, <code>Map<\/code>, <code>Set<\/code>, and <code>NodeList<\/code> are few objects that implement the iterable protocol<\/li>\n<\/ul>\n<h2>2. JavaScript Iterators 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=\"490\" height=\"446\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/project-structure-img-1.jpg\" alt=\"JavaScript Iterators - Project Structure\" class=\"wp-image-23344\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/project-structure-img-1.jpg 490w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/project-structure-img-1-300x273.jpg 300w\" sizes=\"(max-width: 490px) 100vw, 490px\" \/><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\/2018\/12\/js_iterator_project_guide_1.jpg\" alt=\"JavaScript Iterators - Maven Project\" class=\"wp-image-23345\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/js_iterator_project_guide_1.jpg 657w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/js_iterator_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\/2018\/12\/js_iterator_project_guide_2.jpg\" alt=\"JavaScript Iterators - Project Details\" class=\"wp-image-23346\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/js_iterator_project_guide_2.jpg 598w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/js_iterator_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\/2018\/12\/js_iterator_project_guide_3.jpg\" alt=\"JavaScript Iterators - Archetype Selection\" class=\"wp-image-23347\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/js_iterator_project_guide_3.jpg 515w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/js_iterator_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=\"818\" height=\"744\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/js_iterator_project_guide_4.jpg\" alt=\"JavaScript Iterators - Archetype Parameters\" class=\"wp-image-23348\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/js_iterator_project_guide_4.jpg 818w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/js_iterator_project_guide_4-300x273.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/js_iterator_project_guide_4-768x699.jpg 768w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><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.iterators&lt;\/groupId&gt;\n\t&lt;artifactId&gt;JavascriptIterators&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>JavascriptIterators\/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 iterators tutorial --&gt;\n&lt;div id=\"title\"&gt;\n&lt;h4 class=\"text-info\"&gt;What is a Iterator?&lt;\/h4&gt;\n&lt;ul&gt;\n\t&lt;li&gt;Introduced in ES6 to loop over any collection in javascript.&lt;\/li&gt;\n\t&lt;li&gt;According to ES6:\n\t\t&lt;ul&gt;\n\t\t\t&lt;li&gt;An &lt;em&gt;iterable&lt;\/em&gt; is a data structure that make its elements accessible to the public. It is implemented by a method whose key is &lt;code&gt;Symbol.iterator&lt;\/code&gt;.\n\t\t\t\t&lt;ul&gt;\n\t\t\t\t\t&lt;li&gt;The &lt;code&gt;Symbol.iterator&lt;\/code&gt; method returns an object (i.e. &lt;mark&gt;Iterator&lt;\/mark&gt;) with a method called &lt;code&gt;next()&lt;\/code&gt;, which assembles each value in the collection each time it gets called.&lt;\/li&gt;\n\t\t\t\t&lt;\/ul&gt;\n\t\t\t&lt;\/li&gt;\n\t\t\t&lt;li&gt;An &lt;em&gt;iterator&lt;\/em&gt; is a pointer for traversing the elements of a data structure.&lt;\/li&gt;\n\t\t\t&lt;li&gt;&lt;code&gt;Array&lt;\/code&gt;, &lt;code&gt;String&lt;\/code&gt;, &lt;code&gt;Map&lt;\/code&gt;, &lt;code&gt;Set&lt;\/code&gt;, and &lt;code&gt;NodeList&lt;\/code&gt; are few objects that implement the iterable protocol.&lt;\/li&gt;\n\t\t&lt;\/ul&gt;\n\t&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;div&gt;&nbsp;&lt;\/div&gt;\n\n&lt;button id=\"btn_submit\" type=\"button\" class=\"btn btn-success\" onclick=\"getEmployees();\"&gt;Click me&lt;\/button&gt;\n&lt;div&gt;&nbsp;&lt;\/div&gt;\n\n&lt;ul id=\"result\"&gt;&lt;\/ul&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 <em>iterators<\/em> 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;\">var ul = document.getElementById(\"result\");\n\n\/\/ User-defined array.\nlet elist = [\n\t\t{ firstname: 'John', lastname: 'Lark' },\n\t\t{ firstname: 'Natalie', lastname: 'Atlas' },\n\t\t{ firstname: 'Daniel', lastname: 'Brown' },\n\t\t{ firstname: 'Tom', lastname: 'Hunt' },\n\t\t{ firstname: 'Edward', lastname: 'Clark' },\n\t\t{ firstname: 'Jason', lastname: 'Bourne' }\n];\n\nfunction getEmployees() {\n\t\/\/ Looping through the array elements to display the result.\n\tfor (let employee of elist) {\n\n\t\t\/\/ Logic to create the dynamic 'li' tags.\n\t\tvar li = document.createElement(\"li\");\n\t\tli.appendChild(document.createTextNode(employee.firstname + \" \" + employee.lastname));\n\t\tul.appendChild(li);\n\t}\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;Iterators in JavaScript&lt;\/h2&gt;\n        &lt;hr \/&gt;\n\n        &lt;!-- Javascript iterators tutorial --&gt;\n        &lt;div id=\"title\"&gt;\n            &lt;h4 class=\"text-info\"&gt;What is a Iterator?&lt;\/h4&gt;\n            &lt;ul&gt;\n                &lt;li&gt;Introduced in ES6 to loop over any collection in javascript.&lt;\/li&gt;\n                &lt;li&gt;According to ES6:\n                    &lt;ul&gt;\n                        &lt;li&gt;An &lt;em&gt;iterable&lt;\/em&gt; is a data structure that make its elements accessible to the public. It is implemented by a method whose key is &lt;code&gt;Symbol.iterator&lt;\/code&gt;.\n                            &lt;ul&gt;\n                                &lt;li&gt;The &lt;code&gt;Symbol.iterator&lt;\/code&gt; method returns an object (i.e. &lt;mark&gt;Iterator&lt;\/mark&gt;) with a method called &lt;code&gt;next()&lt;\/code&gt;, which assembles each value in the collection each time it gets called.&lt;\/li&gt;\n                            &lt;\/ul&gt;\n                        &lt;\/li&gt;\n                        &lt;li&gt;An &lt;em&gt;iterator&lt;\/em&gt; is a pointer for traversing the elements of a data structure.&lt;\/li&gt;\n                        &lt;li&gt;&lt;code&gt;Array&lt;\/code&gt;, &lt;code&gt;String&lt;\/code&gt;, &lt;code&gt;Map&lt;\/code&gt;, &lt;code&gt;Set&lt;\/code&gt;, and &lt;code&gt;NodeList&lt;\/code&gt; are few objects that implement the iterable protocol.&lt;\/li&gt;\n                    &lt;\/ul&gt;\n                &lt;\/li&gt;\n            &lt;\/ul&gt;\n            &lt;div&gt;&nbsp;&lt;\/div&gt;\n\n            &lt;button id=\"btn_submit\" type=\"button\" class=\"btn btn-success\" onclick=\"getEmployees();\"&gt;Click me&lt;\/button&gt;\n            &lt;div&gt;&nbsp;&lt;\/div&gt;\n\n            &lt;ul id=\"result\"&gt;&lt;\/ul&gt;\n        &lt;\/div&gt;\n    &lt;\/div&gt;\n    &lt;script&gt;\n        var ul = document.getElementById(\"result\");\n\n        \/\/ User-defined array.\n        let elist = [\n\t\t\t\t{ firstname: 'John', lastname: 'Lark' },\n\t\t\t\t{ firstname: 'Natalie', lastname: 'Atlas' },\n\t\t\t\t{ firstname: 'Daniel', lastname: 'Brown' },\n\t\t\t\t{ firstname: 'Tom', lastname: 'Hunt' },\n\t\t\t\t{ firstname: 'Edward', lastname: 'Clark' },\n\t\t\t\t{ firstname: 'Jason', lastname: 'Bourne' }\n\t\t];\n\n        function getEmployees() {\n            \/\/ Looping through the array elements to display the result.\n            for (let employee of elist) {\n\n                \/\/ Logic to create the dynamic 'li' tags.\n                var li = document.createElement(\"li\");\n                li.appendChild(document.createTextNode(employee.firstname + \" \" + employee.lastname));\n                ul.appendChild(li);\n            }\n        }\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=\"311\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/deploy-img-1-3.jpg\" alt=\"JavaScript Iterators - Deploy Application on Tomcat\" class=\"wp-image-23349\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/deploy-img-1-3.jpg 818w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/deploy-img-1-3-300x114.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/deploy-img-1-3-768x292.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\/JavascriptIterators\/<\/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=\"249\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/demo-img-1-3.jpg\" alt=\"JavaScript Iterators - Index page\" class=\"wp-image-23350\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/demo-img-1-3.jpg 818w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/demo-img-1-3-300x91.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/demo-img-1-3-768x234.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 employee names as shown in fig.8.<\/p>\n<p><\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" width=\"818\" height=\"352\" src=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/demo-img-2-1.jpg\" alt=\"JavaScript Iterators\" class=\"wp-image-23351\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/demo-img-2-1.jpg 818w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/demo-img-2-1-300x129.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/demo-img-2-1-768x330.jpg 768w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><figcaption>Fig. 8: Iterators in JavaScript<\/figcaption><\/figure><\/div>\n\n\n<p>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 iterators in the javascript language.<\/p>\n<div class=\"download\"><strong>Download<\/strong><br>You can download the full source code of this example here:&nbsp;<a target=\"_blank\" href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/12\/JavascriptIterators.zip\"><strong>JavascriptIterators<\/strong><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>Greetings readers, in this tutorial, we will understand Iterators 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. The JavaScript &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-23342","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 Iterators Example - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Interested to learn more about JavaScript? 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