{"id":25599386,"date":"2025-01-12T23:03:20","date_gmt":"2025-01-12T17:33:20","guid":{"rendered":"https:\/\/entri.app\/blog\/?p=25599386"},"modified":"2025-01-12T23:11:29","modified_gmt":"2025-01-12T17:41:29","slug":"walmart-javascript-interview-questions","status":"publish","type":"post","link":"https:\/\/entri.app\/blog\/walmart-javascript-interview-questions\/","title":{"rendered":"Walmart Javascript Interview Questions"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69d46c2ff3498\" class=\"ez-toc-cssicon-toggle-label\"><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><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69d46c2ff3498\"  aria-label=\"Toggle\" \/><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:\/\/entri.app\/blog\/walmart-javascript-interview-questions\/#Introduction\" >Introduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/entri.app\/blog\/walmart-javascript-interview-questions\/#Why_Join_in_Walmart\" >Why Join in Walmart?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/entri.app\/blog\/walmart-javascript-interview-questions\/#Walmart_Interview_Preparation_Tips_for_Javascript\" >Walmart Interview Preparation Tips for Javascript<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/entri.app\/blog\/walmart-javascript-interview-questions\/#Top_Walmart_Javascript_Interview_Questions_and_Answers\" >Top Walmart Javascript Interview Questions and Answers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/entri.app\/blog\/walmart-javascript-interview-questions\/#Walmart_Javascript_Technical_Interview_Questions_and_Answers\" >Walmart Javascript Technical Interview Questions and Answers<\/a><\/li><\/ul><\/nav><\/div>\n<p>Preparing for a Walmart JavaScript interview can be a critical step towards securing a role in one of the largest retail companies in the world. JavaScript plays a vital role in the development of dynamic, responsive, and high-performing web applications at Walmart. Whether you&#8217;re applying for a front-end developer or full-stack role, mastering JavaScript concepts is essential.<\/p>\n<p>This blog is designed to help you navigate the common interview questions related to JavaScript, ranging from basic to advanced topics. You\u2019ll encounter questions that test your knowledge of core JavaScript principles like closures, promises, and the event loop, as well as your ability to work with the DOM and optimize web performance. By understanding these topics and practicing sample questions, you\u2019ll be well-equipped to showcase your JavaScript expertise and increase your chances of success in the Walmart interview process.<\/p>\n<p style=\"text-align: center\"><strong><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/?utm_source=full-stack-web-development&amp;utm_medium=blog_referral&amp;utm_campaign=mindtree-node-js-interview-questions\" target=\"_blank\" rel=\"noopener\">Learn Full Stack Development with expert mentors! Get Free Demo Here!<\/a><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Introduction\"><\/span><span data-sheets-root=\"1\"><strong>Introduction<\/strong><br \/>\n<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Walmart Inc. is a global retail powerhouse and one of the largest companies in the world by revenue. Founded in 1962 by Sam Walton, Walmart started as a single store in Rogers, Arkansas, with a vision to offer customers affordable prices and great value. Over the years, the company has expanded its footprint to become an international retail giant with operations spanning more than 20 countries and over 10,000 stores worldwide, including in the U.S., Canada, Mexico, Chile, China, and India.<\/p>\n<h4><strong>Retail and E-Commerce Leadership:<\/strong><\/h4>\n<p>Walmart\u2019s core business is retail, and it offers a diverse range of products such as groceries, apparel, electronics, furniture, and home goods. The company\u2019s stores are divided into three main categories: Walmart Supercenters (large stores that offer a full range of groceries and general merchandise), Walmart Discount Stores (focused on general merchandise), and Walmart Neighborhood Markets (smaller stores with a focus on groceries). Walmart also operates Sam\u2019s Club, a membership-based warehouse club that provides bulk goods and exclusive deals.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Why_Join_in_Walmart\"><\/span><span data-sheets-root=\"1\"><strong>Why Join in Walmart?<\/strong><br \/>\n<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Joining Walmart as a JavaScript developer offers unique opportunities to work for one of the world\u2019s largest and most innovative retail companies. Here are several compelling reasons to consider a career with Walmart:<\/p>\n<h4><strong>1. Work on Cutting-Edge Technologies<\/strong><\/h4>\n<p>Walmart is at the forefront of digital transformation in the retail industry, embracing the latest technologies to enhance customer experiences and optimize operations. As a JavaScript developer, you\u2019ll have the chance to work with modern tools and frameworks, including React, Node.js, and Angular, to develop innovative web applications and features.<\/p>\n<h4><strong>2. Impact Millions of Users<\/strong><\/h4>\n<p>With millions of customers using Walmart\u2019s website and mobile apps every day, your work as a JavaScript developer will have a direct impact on their shopping experience. You&#8217;ll be building high-performance, scalable applications that improve customer engagement and streamline transactions.<\/p>\n<h4><strong>3. Collaborate in a Dynamic, Cross-Functional Team<\/strong><\/h4>\n<p>At Walmart, you\u2019ll have the chance to collaborate with a diverse and talented team of developers, designers, product managers, and data scientists. The company fosters a collaborative and inclusive work culture, where your ideas and contributions are valued.<\/p>\n<h4><strong>4. Focus on Innovation and Problem-Solving<\/strong><\/h4>\n<p>Walmart thrives on innovation. As a JavaScript developer, you\u2019ll be encouraged to think creatively and solve complex problems. Whether it\u2019s improving the performance of the website, optimizing the user interface, or integrating advanced technologies like AI, there will always be new challenges to keep you engaged.<\/p>\n<h4><strong>5. Career Growth and Learning Opportunities<\/strong><\/h4>\n<p>Walmart places a strong emphasis on employee growth and development. As a JavaScript developer, you\u2019ll have access to extensive learning resources, workshops, and mentorship programs to continuously enhance your technical skills. Whether you want to specialize in front-end, back-end, or full-stack development, Walmart provides the tools and support you need to grow in your career. The company also offers internal career mobility, allowing you to explore different roles or even switch between departments as you progress.<\/p>\n<h4><strong>6. Competitive Compensation and Benefits<\/strong><\/h4>\n<p>Walmart offers competitive salary packages, which often include bonuses and stock options. The company also provides a comprehensive benefits package, including health insurance, retirement savings plans, paid time off, and employee discounts.<\/p>\n<h4><strong>7. Work on a Large-Scale E-Commerce Platform<\/strong><\/h4>\n<p>Walmart is one of the biggest players in the e-commerce space, competing with giants like Amazon. As a JavaScript developer, you will be working on a highly scalable platform that handles millions of transactions daily.<\/p>\n<h4><strong>8. Focus on Sustainability and Social Responsibility<\/strong><\/h4>\n<p>Walmart is committed to creating a positive impact on the environment and communities. As a company, it strives to achieve sustainability goals, reduce waste, and ensure ethical sourcing of products. Working for Walmart means you\u2019re part of a team that values corporate social responsibility and takes steps to contribute to a better world.<\/p>\n<h4><strong>9. Flexible Work Environment<\/strong><\/h4>\n<p>Walmart embraces flexible working arrangements, offering options for remote work or hybrid schedules, depending on the position. This flexibility allows you to maintain a healthy work-life balance while still making significant contributions to the company\u2019s goals. I<\/p>\n<h4><strong>10. Global Impact and Career Mobility<\/strong><\/h4>\n<p>Walmart\u2019s vast global presence gives you the chance to work on projects with international scope, allowing you to experience the challenges of developing for diverse markets. With career opportunities across different regions and departments, you can continue to grow within the company while exploring various facets of technology and business.<\/p>\n<p style=\"text-align: center\"><strong><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/?utm_source=full-stack-web-development&amp;utm_medium=blog_referral&amp;utm_campaign=mindtree-node-js-interview-questions\" target=\"_blank\" rel=\"noopener\">Learn Full Stack Development with expert mentors! Get Free Demo Here!<\/a><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Walmart_Interview_Preparation_Tips_for_Javascript\"><\/span><span data-sheets-root=\"1\"><strong>Walmart Interview Preparation Tips for Javascript<\/strong><br \/>\n<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Here are some Walmart Interview Preparation Tips for JavaScript:<\/p>\n<h4><strong>1. Understand Core JavaScript Concepts<\/strong><\/h4>\n<ul>\n<li><strong>Data Types and Variables<\/strong>: Know the difference between <code>var<\/code>, <code>let<\/code>, and <code>const<\/code>, as well as primitive vs. reference data types.<\/li>\n<li><strong>Scope and Closures<\/strong>: Be clear about the scope of variables and the concept of closures, especially when it comes to asynchronous code.<\/li>\n<li><strong>Hoisting<\/strong>: Understand how variable and function declarations are hoisted in JavaScript.<\/li>\n<li><strong>Promises and Async\/Await<\/strong>: Be comfortable with asynchronous code and promise chaining.<\/li>\n<\/ul>\n<h4><strong>2. DOM Manipulation and Events<\/strong><\/h4>\n<ul>\n<li>Familiarize yourself with the DOM (Document Object Model) and how to manipulate it using JavaScript.<\/li>\n<li>Understand event handling, event propagation, and event delegation.<\/li>\n<li>Know how to work with different types of events like <code>click<\/code>, <code>load<\/code>, and <code>submit<\/code>.<\/li>\n<\/ul>\n<h4><strong>3. Array and Object Methods<\/strong><\/h4>\n<ul>\n<li>Be able to manipulate arrays using methods like <code>.map()<\/code>, <code>.filter()<\/code>, <code>.reduce()<\/code>, <code>.forEach()<\/code>, etc.<\/li>\n<li>Know how to work with objects, including object destructuring and object methods.<\/li>\n<\/ul>\n<h4><strong>4. ES6+ Features<\/strong><\/h4>\n<ul>\n<li><strong>Arrow Functions<\/strong>: Understand how they differ from regular functions, especially in terms of <code>this<\/code> context.<\/li>\n<li><strong>Template Literals<\/strong>: Be comfortable using template literals for string interpolation.<\/li>\n<li><strong>Destructuring<\/strong>: Know how to destructure arrays and objects.<\/li>\n<li><strong>Modules<\/strong>: Be familiar with the ES6 module system, including <code>import<\/code> and <code>export<\/code>.<\/li>\n<li><strong>Spread and Rest Operators<\/strong>: Understand how to use these operators effectively with arrays and objects.<\/li>\n<\/ul>\n<h4><strong>5. Advanced JavaScript Topics<\/strong><\/h4>\n<ul>\n<li><strong>Currying and Partial Application<\/strong>: Be able to write functions that use currying or partial application.<\/li>\n<li><strong>Higher-Order Functions<\/strong>: Know how to create and use higher-order functions.<\/li>\n<li><strong>Event Loop and Call Stack<\/strong>: Understand the JavaScript execution model, including the call stack, event loop, and task queue.<\/li>\n<\/ul>\n<h4><strong>6. Frameworks and Libraries<\/strong><\/h4>\n<ul>\n<li>Walmart may use frameworks like React, Angular, or Vue.js, so having knowledge of their basics can be helpful.<\/li>\n<li>Understand JavaScript libraries like Lodash, Moment.js, etc., and when to use them.<\/li>\n<\/ul>\n<h4><strong>7. Data Structures and Algorithms<\/strong><\/h4>\n<ul>\n<li>Brush up on data structures such as arrays, linked lists, stacks, queues, and hash tables.<\/li>\n<li>Be prepared to solve algorithmic problems, especially related to sorting, searching, and manipulating data.<\/li>\n<\/ul>\n<h4><strong>8. Debugging and Testing<\/strong><\/h4>\n<ul>\n<li>Familiarize yourself with browser developer tools for debugging JavaScript code.<\/li>\n<li>Understand basic testing concepts like unit testing and tools like Jest or Mocha.<\/li>\n<\/ul>\n<h4><strong>9. Problem-Solving and Coding Challenges<\/strong><\/h4>\n<ul>\n<li>Practice solving coding problems on platforms like LeetCode, Codewars, or HackerRank to improve your problem-solving skills.<\/li>\n<li>Focus on writing clean, readable, and efficient code.<\/li>\n<\/ul>\n<h4><strong>10. Behavioral and Soft Skills<\/strong><\/h4>\n<ul>\n<li>Be ready to answer behavioral questions about teamwork, problem-solving, and handling deadlines.<\/li>\n<li>Prepare examples from your past experience that demonstrate your skills, such as overcoming challenges or working with others in a project.<\/li>\n<\/ul>\n<p style=\"text-align: center\"><strong><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/?utm_source=full-stack-web-development&amp;utm_medium=blog_referral&amp;utm_campaign=mindtree-node-js-interview-questions\" target=\"_blank\" rel=\"noopener\">Learn Full Stack Development with expert mentors! Get Free Demo Here!<\/a><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Top_Walmart_Javascript_Interview_Questions_and_Answers\"><\/span><strong>Top Walmart Javascript Interview Questions and Answers<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"flex-shrink-0 flex flex-col relative items-end\">\n<div>\n<div class=\"pt-0\">\n<div class=\"gizmo-bot-avatar flex h-8 w-8 items-center justify-center overflow-hidden rounded-full\">\n<div class=\"relative p-1 rounded-sm flex items-center justify-center bg-token-main-surface-primary text-token-text-primary h-8 w-8\">Here\u2019s a list of JavaScript interview questions along with detailed answers that can help you prepare for interviews:<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"group\/conversation-turn relative flex w-full min-w-0 flex-col agent-turn\">\n<div class=\"flex-col gap-1 md:gap-3\">\n<div class=\"flex max-w-full flex-col flex-grow\">\n<div class=\"min-h-8 text-message flex w-full flex-col items-end gap-2 whitespace-normal break-words text-start [.text-message+&amp;]:mt-5\" dir=\"auto\" data-message-author-role=\"assistant\" data-message-id=\"34713344-0211-4b5f-9cd0-c493f4ad8b78\" data-message-model-slug=\"gpt-4o-mini\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[3px]\">\n<div class=\"markdown prose w-full break-words dark:prose-invert light\">\n<h5><strong>1. What are the different data types present in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> JavaScript has 7 primitive data types:<\/p>\n<ul>\n<li><code>Number<\/code><\/li>\n<li><code>String<\/code><\/li>\n<li><code>Boolean<\/code><\/li>\n<li><code>Undefined<\/code><\/li>\n<li><code>Null<\/code><\/li>\n<li><code>Symbol<\/code> (added in ES6)<\/li>\n<li><code>BigInt<\/code> (added in ES11)<\/li>\n<\/ul>\n<p>Additionally, JavaScript has a non-primitive <code>Object<\/code> type, which includes arrays, functions, and objects.<\/p>\n<h5><strong>2. What is the difference between <code>==<\/code> and <code>===<\/code> in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>==<\/code> (loose equality) compares values after converting them to the same type (type coercion).<\/li>\n<li><code>===<\/code> (strict equality) compares both values and types without type coercion.<\/li>\n<\/ul>\n<p>Example:<\/p>\n<ul>\n<li><code>0 == '0'<\/code> is <code>true<\/code><\/li>\n<li><code>0 === '0'<\/code> is <code>false<\/code><\/li>\n<\/ul>\n<h5><strong>3. What is hoisting in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Hoisting is JavaScript&#8217;s default behavior of moving all declarations (var, function, let, const) to the top of their scope during the compile phase, before the code is executed.<\/p>\n<ul>\n<li>Variables declared with <code>var<\/code> are hoisted and initialized with <code>undefined<\/code>.<\/li>\n<li>Variables declared with <code>let<\/code> and <code>const<\/code> are hoisted but are not initialized, leading to a &#8220;temporal dead zone.&#8221;<\/li>\n<\/ul>\n<h5><strong>4. What is the difference between <code>null<\/code> and <code>undefined<\/code> in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>null<\/code> is an assignment value that represents no value or no object.<\/li>\n<li><code>undefined<\/code> means a variable has been declared but not assigned any value.<\/li>\n<\/ul>\n<h5><strong>5. What is closure in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> A closure is a function that &#8220;remembers&#8221; its lexical scope, even when the function is executed outside that scope. This allows for private variables and functions in JavaScript.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">outer<\/span>() {<br \/>\n<span class=\"hljs-keyword\">let<\/span> count = <span class=\"hljs-number\">0<\/span>;<br \/>\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">inner<\/span>() {<br \/>\ncount++;<br \/>\n<span class=\"hljs-keyword\">return<\/span> count;<br \/>\n}<br \/>\n}<br \/>\n<span class=\"hljs-keyword\">const<\/span> counter = <span class=\"hljs-title function_\">outer<\/span>();<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-title function_\">counter<\/span>()); <span class=\"hljs-comment\">\/\/ 1<\/span><br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-title function_\">counter<\/span>()); <span class=\"hljs-comment\">\/\/ 2<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>6. Explain the concept of event delegation.<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Event delegation is a technique where a single event listener is attached to a parent element rather than multiple listeners on individual child elements. The event bubbles up from the child to the parent, where it is caught.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-variable language_\">document<\/span>.<span class=\"hljs-title function_\">getElementById<\/span>(<span class=\"hljs-string\">'parent'<\/span>).<span class=\"hljs-title function_\">addEventListener<\/span>(<span class=\"hljs-string\">'click'<\/span>, <span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">event<\/span>) {<br \/>\n<span class=\"hljs-keyword\">if<\/span> (event.<span class=\"hljs-property\">target<\/span> &amp;&amp; event.<span class=\"hljs-property\">target<\/span>.<span class=\"hljs-title function_\">matches<\/span>(<span class=\"hljs-string\">'button.classname'<\/span>)) {<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">'Button clicked!'<\/span>);<br \/>\n}<br \/>\n});<br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>7. What are promises in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> A promise is an object representing the eventual completion (or failure) of an asynchronous operation. It has three states:<\/p>\n<ul>\n<li>Pending<\/li>\n<li>Fulfilled<\/li>\n<li>Rejected<\/li>\n<\/ul>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> myPromise = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Promise<\/span>(<span class=\"hljs-function\">(<span class=\"hljs-params\">resolve, reject<\/span>) =&gt;<\/span> {<br \/>\n<span class=\"hljs-keyword\">let<\/span> success = <span class=\"hljs-literal\">true<\/span>;<br \/>\n<span class=\"hljs-keyword\">if<\/span> (success) <span class=\"hljs-title function_\">resolve<\/span>(<span class=\"hljs-string\">\"Task completed\"<\/span>);<br \/>\n<span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-title function_\">reject<\/span>(<span class=\"hljs-string\">\"Task failed\"<\/span>);<br \/>\n});<\/code><\/code>myPromise.<span class=\"hljs-title function_\">then<\/span>(<span class=\"hljs-function\"><span class=\"hljs-params\">result<\/span> =&gt;<\/span> <span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(result)).<span class=\"hljs-title function_\">catch<\/span>(<span class=\"hljs-function\"><span class=\"hljs-params\">error<\/span> =&gt;<\/span> <span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(error));<\/div>\n<\/div>\n<h5><strong>8. What is the difference between <code>let<\/code>, <code>var<\/code>, and <code>const<\/code>?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>var<\/code>: Function-scoped or globally-scoped, can be re-declared and updated.<\/li>\n<li><code>let<\/code>: Block-scoped, can be updated but not re-declared within the same scope.<\/li>\n<li><code>const<\/code>: Block-scoped, cannot be updated or re-declared. However, objects and arrays assigned to <code>const<\/code> can be modified.<\/li>\n<\/ul>\n<h5><strong>9. What is the purpose of the <code>bind()<\/code> method in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> The <code>bind()<\/code> method creates a new function that, when called, has its <code>this<\/code> keyword set to the provided value, and can optionally be pre-configured with arguments.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">greet<\/span>(<span class=\"hljs-params\">name<\/span>) {<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">`Hello, <span class=\"hljs-subst\">${name}<\/span>`<\/span>);<br \/>\n}<br \/>\n<span class=\"hljs-keyword\">const<\/span> greetUser = greet.<span class=\"hljs-title function_\">bind<\/span>(<span class=\"hljs-literal\">null<\/span>, <span class=\"hljs-string\">'John'<\/span>);<br \/>\n<span class=\"hljs-title function_\">greetUser<\/span>(); <span class=\"hljs-comment\">\/\/ \"Hello, John\"<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>10. What is the difference between <code>call()<\/code> and <code>apply()<\/code> in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Both <code>call()<\/code> and <code>apply()<\/code> are used to invoke a function with a specific <code>this<\/code> value and arguments:<\/p>\n<ul>\n<li><code>call()<\/code> accepts arguments one by one.<\/li>\n<li><code>apply()<\/code> accepts arguments as an array.<\/li>\n<\/ul>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">introduce<\/span>(<span class=\"hljs-params\">name, age<\/span>) {<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">`I am <span class=\"hljs-subst\">${name}<\/span> and I am <span class=\"hljs-subst\">${age}<\/span> years old.`<\/span>);<br \/>\n}<br \/>\nintroduce.<span class=\"hljs-title function_\">call<\/span>(<span class=\"hljs-literal\">null<\/span>, <span class=\"hljs-string\">'Alice'<\/span>, <span class=\"hljs-number\">25<\/span>); <span class=\"hljs-comment\">\/\/ call<\/span><br \/>\nintroduce.<span class=\"hljs-title function_\">apply<\/span>(<span class=\"hljs-literal\">null<\/span>, [<span class=\"hljs-string\">'Alice'<\/span>, <span class=\"hljs-number\">25<\/span>]); <span class=\"hljs-comment\">\/\/ apply<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>11. What is the <code>this<\/code> keyword in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> The <code>this<\/code> keyword refers to the context in which a function is called. Its value is determined by how a function is invoked:<\/p>\n<ul>\n<li>In a method, <code>this<\/code> refers to the object the method is called on.<\/li>\n<li>In a regular function, <code>this<\/code> refers to the global object (<code>window<\/code> in browsers).<\/li>\n<li>In arrow functions, <code>this<\/code> is lexically bound to the surrounding context.<\/li>\n<\/ul>\n<h5><strong>12. What is the event loop in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> The event loop is a mechanism that allows JavaScript to handle asynchronous operations like I\/O, timers, etc. It constantly checks the call stack and message queue to ensure that code execution happens in the correct order.<\/p>\n<h5><strong>13. What are higher-order functions in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Higher-order functions are functions that take other functions as arguments or return functions as their result. Examples include <code>map()<\/code>, <code>filter()<\/code>, and <code>reduce()<\/code>.<\/p>\n<h5><strong>14. What is the difference between synchronous and asynchronous code?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li>Synchronous code runs sequentially, blocking the next task until the current one finishes.<\/li>\n<li>Asynchronous code allows tasks to run in parallel, enabling the execution of other tasks while waiting for a task to complete (e.g., using callbacks, promises, async\/await).<\/li>\n<\/ul>\n<h5><strong>15. Explain the concept of the prototype in JavaScript.<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Every JavaScript object has an internal property called <code>prototype<\/code>. It is used to share properties and methods between objects. When you try to access a property or method, JavaScript will look at the object itself first and then in its prototype chain.<\/p>\n<h5><strong>16. What is an IIFE (Immediately Invoked Function Expression)?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> An IIFE is a function that is defined and executed immediately after its creation. It&#8217;s often used to create a private scope.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\">(<span class=\"hljs-keyword\">function<\/span>() {<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">'I am an IIFE!'<\/span>);<br \/>\n})();<br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>17. What is destructuring in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Destructuring allows you to unpack values from arrays or properties from objects into distinct variables.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> [x, y] = [<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">20<\/span>]; <span class=\"hljs-comment\">\/\/ Array destructuring<\/span><br \/>\n<span class=\"hljs-keyword\">const<\/span> {name, age} = {<span class=\"hljs-attr\">name<\/span>: <span class=\"hljs-string\">'Alice'<\/span>, <span class=\"hljs-attr\">age<\/span>: <span class=\"hljs-number\">25<\/span>}; <span class=\"hljs-comment\">\/\/ Object destructuring<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>18. What is the spread operator in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> The spread operator (<code>...<\/code>) allows iterables (like arrays or objects) to be expanded into individual elements or properties.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> arr = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>];<br \/>\n<span class=\"hljs-keyword\">const<\/span> newArr = [...arr, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">5<\/span>]; <span class=\"hljs-comment\">\/\/ Spread in arrays<\/span><\/code><\/code><span class=\"hljs-keyword\">const<\/span> obj = {<span class=\"hljs-attr\">a<\/span>: <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-attr\">b<\/span>: <span class=\"hljs-number\">2<\/span>};<br \/>\n<span class=\"hljs-keyword\">const<\/span> newObj = {&#8230;obj, <span class=\"hljs-attr\">c<\/span>: <span class=\"hljs-number\">3<\/span>}; <span class=\"hljs-comment\">\/\/ Spread in objects<\/span><\/div>\n<\/div>\n<h5><strong>19. What is the rest parameter in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> The rest parameter (<code>...<\/code>) allows a function to accept an indefinite number of arguments as an array.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">sum<\/span>(<span class=\"hljs-params\">...numbers<\/span>) {<br \/>\n<span class=\"hljs-keyword\">return<\/span> numbers.<span class=\"hljs-title function_\">reduce<\/span>(<span class=\"hljs-function\">(<span class=\"hljs-params\">total, num<\/span>) =&gt;<\/span> total + num, <span class=\"hljs-number\">0<\/span>);<br \/>\n}<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-title function_\">sum<\/span>(<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>)); <span class=\"hljs-comment\">\/\/ 6<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>20. What are arrow functions in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Arrow functions provide a shorter syntax for writing functions and do not have their own <code>this<\/code> context, instead, they inherit <code>this<\/code> from the surrounding lexical scope.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> <span class=\"hljs-title function_\">add<\/span> = (<span class=\"hljs-params\">a, b<\/span>) =&gt; a + b;<br \/>\n<\/code><\/div>\n<div dir=\"ltr\" style=\"text-align: center\"><strong><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/?utm_source=full-stack-web-development&amp;utm_medium=blog_referral&amp;utm_campaign=mindtree-node-js-interview-questions\" target=\"_blank\" rel=\"noopener\">Learn Full Stack Development with expert mentors! Get Free Demo Here!<\/a><\/strong><\/div>\n<\/div>\n<h5><strong>21. Explain the concept of <code>setTimeout()<\/code> and <code>setInterval()<\/code> in JavaScript.<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>setTimeout(callback, delay)<\/code>: Executes the callback function once after the specified delay.<\/li>\n<li><code>setInterval(callback, interval)<\/code>: Executes the callback function repeatedly at the specified interval.<\/li>\n<\/ul>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-built_in\">setTimeout<\/span>(<span class=\"hljs-function\">() =&gt;<\/span> <span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">'This runs after 2 seconds'<\/span>), <span class=\"hljs-number\">2000<\/span>);<br \/>\n<span class=\"hljs-built_in\">setInterval<\/span>(<span class=\"hljs-function\">() =&gt;<\/span> <span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">'This runs every 2 seconds'<\/span>), <span class=\"hljs-number\">2000<\/span>);<br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>22. What is an asynchronous function in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> An asynchronous function is a function that performs asynchronous operations using <code>async<\/code> and <code>await<\/code>. It returns a promise and allows you to write asynchronous code in a more readable, synchronous-like manner.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">async<\/span> <span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">fetchData<\/span>() {<br \/>\n<span class=\"hljs-keyword\">let<\/span> response = <span class=\"hljs-keyword\">await<\/span> <span class=\"hljs-title function_\">fetch<\/span>(<span class=\"hljs-string\">'https:\/\/example.com'<\/span>);<br \/>\n<span class=\"hljs-keyword\">let<\/span> data = <span class=\"hljs-keyword\">await<\/span> response.<span class=\"hljs-title function_\">json<\/span>();<br \/>\n<span class=\"hljs-keyword\">return<\/span> data;<br \/>\n}<br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>23. What is the difference between <code>apply()<\/code> and <code>bind()<\/code>?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Both methods set the value of <code>this<\/code>:<\/p>\n<ul>\n<li><code>apply()<\/code> calls the function immediately with arguments passed as an array.<\/li>\n<li><code>bind()<\/code> returns a new function, allowing you to set <code>this<\/code> and arguments, but does not invoke the function immediately.<\/li>\n<\/ul>\n<h5><strong>24. Explain the concept of modules in JavaScript.<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Modules allow code to be divided into separate files, promoting better organization and maintainability. ES6 introduced the <code>import<\/code> and <code>export<\/code> keywords for handling modules.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-comment\">\/\/ Exporting a function<\/span><br \/>\n<span class=\"hljs-keyword\">export<\/span> <span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">greet<\/span>() {<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">'Hello!'<\/span>);<br \/>\n}<\/code><\/code><span class=\"hljs-comment\">\/\/ Importing the function in another file<\/span><br \/>\n<span class=\"hljs-keyword\">import<\/span> { greet } <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">&#8216;.\/greet.js&#8217;<\/span>;<br \/>\n<span class=\"hljs-title function_\">greet<\/span>();<\/div>\n<\/div>\n<h5><strong>25. What are <code>Map<\/code> and <code>Set<\/code> in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>Map<\/code>: A collection of key-value pairs, where keys can be any data type.<\/li>\n<li><code>Set<\/code>: A collection of unique values, with no duplicates.<\/li>\n<\/ul>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> map = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Map<\/span>();<br \/>\nmap.<span class=\"hljs-title function_\">set<\/span>(<span class=\"hljs-string\">'key'<\/span>, <span class=\"hljs-string\">'value'<\/span>);<\/code><\/code><span class=\"hljs-keyword\">const<\/span> set = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Set<\/span>();<\/div>\n<\/div>\n<h5><strong>26. What is the <code><strong>JSON.par<\/strong>se()<\/code> and <code>JSON.stringify()<\/code> in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>JSON.parse()<\/code>: Converts a JSON string into an object.<\/li>\n<li><code>JSON.stringify()<\/code>: Converts an object into a JSON string.<\/li>\n<\/ul>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> obj = { <span class=\"hljs-attr\">name<\/span>: <span class=\"hljs-string\">'Alice'<\/span>, <span class=\"hljs-attr\">age<\/span>: <span class=\"hljs-number\">25<\/span> };<br \/>\n<span class=\"hljs-keyword\">const<\/span> jsonString = <span class=\"hljs-title class_\">JSON<\/span>.<span class=\"hljs-title function_\">stringify<\/span>(obj);<br \/>\n<span class=\"hljs-keyword\">const<\/span> parsedObj = <span class=\"hljs-title class_\">JSON<\/span>.<span class=\"hljs-title function_\">parse<\/span>(jsonString);<br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>27. What is the difference between <code>slice()<\/code> and <code>splice()<\/code> in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>slice()<\/code>: Returns a shallow copy of a portion of an array (does not modify the original array).<\/li>\n<li><code>splice()<\/code>: Changes the content of an array by removing or adding elements.<\/li>\n<\/ul>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> arr = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">4<\/span>];<br \/>\n<span class=\"hljs-keyword\">const<\/span> slicedArr = arr.<span class=\"hljs-title function_\">slice<\/span>(<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">3<\/span>); <span class=\"hljs-comment\">\/\/ [2, 3]<\/span><br \/>\narr.<span class=\"hljs-title function_\">splice<\/span>(<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">5<\/span>, <span class=\"hljs-number\">6<\/span>); <span class=\"hljs-comment\">\/\/ [1, 5, 6, 4]<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>28. What is a JavaScript callback?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> A callback is a function passed as an argument to another function, which is executed after the completion of that function.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">greet<\/span>(<span class=\"hljs-params\">callback<\/span>) {<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">'Hello'<\/span>);<br \/>\n<span class=\"hljs-title function_\">callback<\/span>();<br \/>\n}<br \/>\n<span class=\"hljs-title function_\">greet<\/span>(<span class=\"hljs-function\">() =&gt;<\/span> <span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">'World!'<\/span>));<br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>29. What are the uses of <code>Array.prototype.map()<\/code>, <code>filter()<\/code>, and <code>reduce()<\/code>?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>map()<\/code>: Creates a new array with the results of calling a function on every element.<\/li>\n<li><code>filter()<\/code>: Creates a new array with all elements that pass a test.<\/li>\n<li><code>reduce()<\/code>: Applies a function to an accumulator and each element to reduce it to a single value.<\/li>\n<\/ul>\n<h5><strong>30. What is the difference between <code>window.onload<\/code> and <code>document.ready<\/code> in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>window.onload<\/code>: Fires when the entire page (including images, scripts, and styles) is loaded.<\/li>\n<li><code>document.ready<\/code>: Executes when the DOM is ready, even before images and styles are loaded (commonly used with jQuery).<\/li>\n<\/ul>\n<h5><strong>31. What is the difference between <code>localStorage<\/code> and <code>sessionStorage<\/code>?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>localStorage<\/code>: Stores data with no expiration time. Data persists even after the browser is closed.<\/li>\n<li><code>sessionStorage<\/code>: Stores data for the duration of the page session. Data is cleared when the browser tab is closed.<\/li>\n<\/ul>\n<h5><strong>32. What is the difference between <code>push()<\/code> and <code>pop()<\/code> methods in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>push()<\/code>: Adds one or more elements to the end of an array.<\/li>\n<li><code>pop()<\/code>: Removes the last element from an array.<\/li>\n<\/ul>\n<h5><strong>33. What is a JavaScript generator function?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> A generator function is a special type of function that can pause its execution and later resume from where it left off, using <code>yield<\/code>.<\/p>\n<p>Example:<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">function<\/span>* <span class=\"hljs-title function_\">numbers<\/span>() {<br \/>\n<span class=\"hljs-keyword\">yield<\/span> <span class=\"hljs-number\">1<\/span>;<br \/>\n<span class=\"hljs-keyword\">yield<\/span> <span class=\"hljs-number\">2<\/span>;<br \/>\n<span class=\"hljs-keyword\">yield<\/span> <span class=\"hljs-number\">3<\/span>;<br \/>\n}<br \/>\n<span class=\"hljs-keyword\">const<\/span> gen = <span class=\"hljs-title function_\">numbers<\/span>();<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(gen.<span class=\"hljs-title function_\">next<\/span>()); <span class=\"hljs-comment\">\/\/ { value: 1, done: false }<\/span><br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(gen.<span class=\"hljs-title function_\">next<\/span>()); <span class=\"hljs-comment\">\/\/ { value: 2, done: false }<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>34. What are regular expressions in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Regular expressions are patterns used to match character combinations in strings. They are often used for validating input, searching, and replacing text.<\/p>\n<h5><strong>35. What is <code><strong>setImm<\/strong>ediate()<\/code> in Node.js?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> <code>setImmediate()<\/code> is a Node.js function used to execute a callback after the current event loop cycle.<\/p>\n<p style=\"text-align: center\"><strong><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/?utm_source=full-stack-web-development&amp;utm_medium=blog_referral&amp;utm_campaign=mindtree-node-js-interview-questions\" target=\"_blank\" rel=\"noopener\">Learn Full Stack Development with expert mentors! Get Free Demo Here!<\/a><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Walmart_Javascript_Technical_Interview_Questions_and_Answers\"><\/span><strong>Walmart Javascript Technical Interview Questions and Answers<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<h5><strong>1. What are the different data types in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> JavaScript has several data types:<\/p>\n<ul>\n<li><strong>Primitive types<\/strong>: <code>Number<\/code>, <code>String<\/code>, <code>Boolean<\/code>, <code>Null<\/code>, <code>Undefined<\/code>, <code>Symbol<\/code>, and <code>BigInt<\/code>.<\/li>\n<li><strong>Reference types<\/strong>: <code>Object<\/code> (which includes <code>Array<\/code>, <code>Function<\/code>, <code>Date<\/code>, etc.).<\/li>\n<\/ul>\n<h5><strong>2. Explain the difference between <code>let<\/code>, <code>var<\/code>, and <code>const<\/code>.<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>var<\/code>: Function-scoped, can be redeclared and updated, hoisted but initialized as <code>undefined<\/code>.<\/li>\n<li><code>let<\/code>: Block-scoped, cannot be redeclared but can be updated, hoisted but not initialized.<\/li>\n<li><code>const<\/code>: Block-scoped, cannot be redeclared or updated, value must be assigned at declaration.<\/li>\n<\/ul>\n<h5><strong>3. What is the difference between <code>==<\/code> and <code>===<\/code> in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>==<\/code>: Compares values for equality, allowing type coercion. For example, <code>5 == '5'<\/code> returns <code>true<\/code>.<\/li>\n<li><code>===<\/code>: Strict equality, compares both value and type. For example, <code>5 === '5'<\/code> returns <code>false<\/code>.<\/li>\n<\/ul>\n<h5><strong>4. What are closures in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> A closure is a function that retains access to its lexical scope even when the function is executed outside that scope. This allows it to access variables defined in the outer function after the outer function has returned.<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">outer<\/span>() {<br \/>\n<span class=\"hljs-keyword\">let<\/span> count = <span class=\"hljs-number\">0<\/span>;<br \/>\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">inner<\/span>() {<br \/>\ncount++;<br \/>\n<span class=\"hljs-keyword\">return<\/span> count;<br \/>\n};<br \/>\n}<\/code><\/code><span class=\"hljs-keyword\">const<\/span> counter = <span class=\"hljs-title function_\">outer<\/span>();<br \/>\n<span class=\"hljs-title function_\">counter<\/span>(); <span class=\"hljs-comment\">\/\/ 1<\/span><br \/>\n<span class=\"hljs-title function_\">counter<\/span>(); <span class=\"hljs-comment\">\/\/ 2<\/span><\/p>\n<\/div>\n<\/div>\n<h5><strong>5. What is event delegation in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Event delegation is a technique where a single event listener is attached to a parent element to manage events for multiple child elements. It utilizes event bubbling to capture events from child elements and handle them using the parent element\u2019s event listener.<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-variable language_\">document<\/span>.<span class=\"hljs-title function_\">querySelector<\/span>(<span class=\"hljs-string\">'#parent'<\/span>).<span class=\"hljs-title function_\">addEventListener<\/span>(<span class=\"hljs-string\">'click'<\/span>, <span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">event<\/span>) {<br \/>\n<span class=\"hljs-keyword\">if<\/span> (event.<span class=\"hljs-property\">target<\/span>.<span class=\"hljs-title function_\">matches<\/span>(<span class=\"hljs-string\">'.child'<\/span>)) {<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">'Child clicked'<\/span>);<br \/>\n}<br \/>\n});<br \/>\n<\/code><\/div>\n<\/div>\n<h5><strong>6. Explain the concept of prototypal inheritance.<\/strong><\/h5>\n<p><strong>Answer:<\/strong> JavaScript uses prototypal inheritance to allow objects to inherit properties and methods from other objects. Every JavaScript object has a <code>prototype<\/code> property that refers to its prototype, and methods or properties defined on the prototype are shared among instances.<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">Person<\/span>(<span class=\"hljs-params\">name<\/span>) {<br \/>\n<span class=\"hljs-variable language_\">this<\/span>.<span class=\"hljs-property\">name<\/span> = name;<br \/>\n}<\/code><\/code><span class=\"hljs-title class_\">Person<\/span>.<span class=\"hljs-property\"><span class=\"hljs-keyword\">prototype<\/span><\/span>.<span class=\"hljs-property\">greet<\/span> = <span class=\"hljs-keyword\">function<\/span>() {<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-string\">`Hello, <span class=\"hljs-subst\">${<span class=\"hljs-variable language_\">this<\/span>.name}<\/span>`<\/span>);<br \/>\n};<\/p>\n<p><code class=\"!whitespace-pre hljs language-javascript\"><code class=\"!whitespace-pre hljs language-javascript\"><\/code><\/code><span class=\"hljs-keyword\">const<\/span> person1 = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">&#8216;John&#8217;<\/span>);<br \/>\nperson1.<span class=\"hljs-title function_\">greet<\/span>(); <span class=\"hljs-comment\">\/\/ Hello, John<\/span><\/p>\n<\/div>\n<\/div>\n<h5><strong>7. What are promises in JavaScript, and how do you use them?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> Promises in JavaScript represent the eventual completion (or failure) of an asynchronous operation. A promise can be in one of three states: <code>pending<\/code>, <code>fulfilled<\/code>, or <code>rejected<\/code>.<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> promise = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Promise<\/span>(<span class=\"hljs-function\">(<span class=\"hljs-params\">resolve, reject<\/span>) =&gt;<\/span> {<br \/>\n<span class=\"hljs-keyword\">let<\/span> success = <span class=\"hljs-literal\">true<\/span>;<br \/>\n<span class=\"hljs-keyword\">if<\/span> (success) {<br \/>\n<span class=\"hljs-title function_\">resolve<\/span>(<span class=\"hljs-string\">'Success!'<\/span>);<br \/>\n} <span class=\"hljs-keyword\">else<\/span> {<br \/>\n<span class=\"hljs-title function_\">reject<\/span>(<span class=\"hljs-string\">'Failure'<\/span>);<br \/>\n}<br \/>\n});<\/code><\/code>promise<br \/>\n.<span class=\"hljs-title function_\">then<\/span>(<span class=\"hljs-function\"><span class=\"hljs-params\">result<\/span> =&gt;<\/span> <span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(result))<br \/>\n.<span class=\"hljs-title function_\">catch<\/span>(<span class=\"hljs-function\"><span class=\"hljs-params\">error<\/span> =&gt;<\/span> <span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(error));<\/p>\n<\/div>\n<\/div>\n<h5><strong>8. What is the difference between <code>map()<\/code> and <code>forEach()<\/code>?<\/strong><\/h5>\n<p><strong>Answer:<\/strong><\/p>\n<ul>\n<li><code>forEach()<\/code>: Iterates over an array and executes a callback for each element. It doesn\u2019t return a new array.<\/li>\n<li><code>map()<\/code>: Iterates over an array and returns a new array where each element is the result of the callback function.<\/li>\n<\/ul>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> arr = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>];<br \/>\narr.<span class=\"hljs-title function_\">forEach<\/span>(<span class=\"hljs-function\"><span class=\"hljs-params\">x<\/span> =&gt;<\/span> <span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(x * <span class=\"hljs-number\">2<\/span>)); <span class=\"hljs-comment\">\/\/ Output: 2, 4, 6<\/span><br \/>\n<span class=\"hljs-keyword\">const<\/span> doubled = arr.<span class=\"hljs-title function_\">map<\/span>(<span class=\"hljs-function\"><span class=\"hljs-params\">x<\/span> =&gt;<\/span> x * <span class=\"hljs-number\">2<\/span>); <span class=\"hljs-comment\">\/\/ doubled: [2, 4, 6]<\/span><\/code><\/div>\n<\/div>\n<h5><strong>9. How does <code><strong>as<\/strong>ync<\/code> and <code>await<\/code> work in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> The <code>async<\/code> keyword is used to define a function that returns a promise. The <code>await<\/code> keyword can only be used inside <code>async<\/code> functions, and it pauses the execution of the function until the promise is resolved.<\/p>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">async<\/span> <span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">fetchData<\/span>() {<br \/>\n<span class=\"hljs-keyword\">let<\/span> response = <span class=\"hljs-keyword\">await<\/span> <span class=\"hljs-title function_\">fetch<\/span>(<span class=\"hljs-string\">'https:\/\/api.example.com\/data'<\/span>);<br \/>\n<span class=\"hljs-keyword\">let<\/span> data = <span class=\"hljs-keyword\">await<\/span> response.<span class=\"hljs-title function_\">json<\/span>();<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(data);<br \/>\n}<\/code><\/code><span class=\"hljs-title function_\">fetchData<\/span>();<\/p>\n<\/div>\n<\/div>\n<h5><strong>10. What is the <code>this<\/code> keyword in JavaScript?<\/strong><\/h5>\n<p><strong>Answer:<\/strong> The <code>this<\/code> keyword refers to the object in which the function is executed:<\/p>\n<ul>\n<li>In a method: refers to the object that owns the method.<\/li>\n<li>In a function: refers to the global object (in non-strict mode).<\/li>\n<li>In strict mode: remains <code>undefined<\/code> in regular functions but behaves normally in arrow functions.<\/li>\n<\/ul>\n<div class=\"contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"!whitespace-pre hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> person = {<br \/>\n<span class=\"hljs-attr\">name<\/span>: <span class=\"hljs-string\">'Alice'<\/span>,<br \/>\n<span class=\"hljs-attr\">greet<\/span>: <span class=\"hljs-keyword\">function<\/span>() {<br \/>\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(<span class=\"hljs-variable language_\">this<\/span>.<span class=\"hljs-property\">name<\/span>); <span class=\"hljs-comment\">\/\/ 'Alice'<\/span><br \/>\n}<br \/>\n};<br \/>\nperson.<span class=\"hljs-title function_\">greet<\/span>();<\/code><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div dir=\"ltr\"><\/div>\n<div dir=\"ltr\" style=\"text-align: center\"><strong><a href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/?utm_source=full-stack-web-development&amp;utm_medium=blog_referral&amp;utm_campaign=mindtree-node-js-interview-questions\" target=\"_blank\" rel=\"noopener\">Learn Full Stack Development with expert mentors! Get Free Demo Here!<\/a><\/strong><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Preparing for a Walmart JavaScript interview can be a critical step towards securing a role in one of the largest retail companies in the world. JavaScript plays a vital role in the development of dynamic, responsive, and high-performing web applications at Walmart. Whether you&#8217;re applying for a front-end developer or full-stack role, mastering JavaScript concepts [&hellip;]<\/p>\n","protected":false},"author":100,"featured_media":25599388,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[802,1926],"tags":[],"class_list":["post-25599386","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","category-full-stack-web-development"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Walmart Javascript Interview Questions - Entri Blog<\/title>\n<meta name=\"description\" content=\"Master key topics to boost your confidence and ace the interview! 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