{"id":7477,"date":"2025-08-01T11:30:21","date_gmt":"2025-08-01T11:30:21","guid":{"rendered":"https:\/\/www.hirist.tech\/blog\/?p=7477"},"modified":"2025-08-01T11:30:22","modified_gmt":"2025-08-01T11:30:22","slug":"top-15-es6-interview-questions-and-answers","status":"publish","type":"post","link":"https:\/\/www.hirist.tech\/blog\/top-15-es6-interview-questions-and-answers\/","title":{"rendered":"Top 15+ ES6 Interview Questions and Answers"},"content":{"rendered":"\n<p>ES6 stands for ECMAScript 2015. It was a major update that made JavaScript more powerful and easier to use. Before ES6, the language lacked many features found in modern programming. This update introduced arrow functions, classes, modules, and promises \u2013 making code cleaner and more efficient.ES6 was introduced by Brendan Eich and later standardized by ECMA International. Today, it is widely used in web development and is a must-know for roles such as front-end developer or full-stack engineer. If you are preparing for one of these roles, these ES6 interview questions and answers can give you a strong head start.<\/p>\n\n\n\n<p><strong>Fun Fact \u2013<\/strong> Over 98% of websites use JavaScript, and more than 90% of those use ES6 features to support modern functionality.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.hirist.tech\/blog\/top-15-es6-interview-questions-and-answers\/#ES6_Interview_Questions_for_Freshers\" title=\"ES6 Interview Questions for Freshers\u00a0\">ES6 Interview Questions for Freshers\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.hirist.tech\/blog\/top-15-es6-interview-questions-and-answers\/#ES6_JavaScript_Interview_Questions_for_Experienced\" title=\"ES6 JavaScript Interview Questions for Experienced\u00a0\">ES6 JavaScript Interview Questions for Experienced\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.hirist.tech\/blog\/top-15-es6-interview-questions-and-answers\/#ES6_Features_Interview_Questions\" title=\"ES6 Features Interview Questions\">ES6 Features Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.hirist.tech\/blog\/top-15-es6-interview-questions-and-answers\/#ES6_Coding_Interview_Questions\" title=\"ES6 Coding Interview Questions\">ES6 Coding Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.hirist.tech\/blog\/top-15-es6-interview-questions-and-answers\/#Tips_to_Prepare_for_ES6_JavaScript_Interview_Questions\" title=\"Tips to Prepare for ES6 JavaScript Interview Questions\">Tips to Prepare for ES6 JavaScript Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.hirist.tech\/blog\/top-15-es6-interview-questions-and-answers\/#Wrapping_Up\" title=\"Wrapping Up\">Wrapping Up<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.hirist.tech\/blog\/top-15-es6-interview-questions-and-answers\/#FAQs\" title=\"FAQs\">FAQs<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ES6_Interview_Questions_for_Freshers\"><\/span>ES6 Interview Questions for Freshers\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are some commonly asked ES6 interview questions and answers to help freshers prepare for JavaScript interview.<\/p>\n\n\n\n<ol>\n<li><strong>What is ES6 and why was it introduced?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>ES6 stands for ECMAScript 2015. It was introduced to fix limitations in JavaScript. It brought cleaner syntax and modern features like classes, modules, and promises. These changes made the language easier for large applications.<\/p>\n\n\n\n<ol start=\"2\">\n<li><strong>What is the difference between var, let, and const in ES6?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>var is function-scoped and can be redeclared. let and const are block-scoped. let allows updates, while const does not. With const, you can\u2019t reassign the variable itself, but object properties can still be changed.<\/p>\n\n\n\n<ol start=\"3\">\n<li><strong>How are arrow functions different from regular functions in JavaScript?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Arrow functions are shorter and don\u2019t have their own this or arguments. They are best for short functions and callbacks. You can\u2019t use them as constructors or hoist them like regular functions.<\/p>\n\n\n\n<ol start=\"4\">\n<li><strong>What are template literals and how are they used in ES6?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Template literals are strings wrapped in backticks (`) instead of quotes. They allow multi-line strings and expression interpolation using ${}. This makes it easier to build dynamic strings without using + for concatenation.<\/p>\n\n\n\n<ol start=\"5\">\n<li><strong>What is destructuring in ES6? Give examples for both arrays and objects.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Destructuring lets you unpack values from arrays or objects into variables.<\/p>\n\n\n\n<p>Example (array): const [x, y] = [1, 2]<\/p>\n\n\n\n<p>Example (object): const {name, age} = person<\/p>\n\n\n\n<p>It saves time and makes code cleaner.<\/p>\n\n\n\n<ol start=\"6\">\n<li><strong>How does the spread operator work in ES6 and where can you use it?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The spread operator (&#8230;) expands arrays or objects.<\/p>\n\n\n\n<p>Example: const arr = [&#8230;a, &#8230;b]<\/p>\n\n\n\n<p>You can use it to copy data, merge arrays, or pass arguments.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ES6_JavaScript_Interview_Questions_for_Experienced\"><\/span>ES6 JavaScript Interview Questions for Experienced\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>This section covers important ES6 interview questions and answers for experienced professionals.<\/p>\n\n\n\n<ol start=\"7\">\n<li><strong>What is the Temporal Dead Zone in ES6?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The Temporal Dead Zone (TDZ) is the time between entering a block and the variable being declared. Accessing a let or const variable before its declaration throws a ReferenceError. It exists to avoid bugs caused by accessing variables too early.<\/p>\n\n\n\n<ol start=\"8\">\n<li><strong>How do Promises work in ES6 and what problems do they solve?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Promises help manage asynchronous code. A Promise has three states: pending, fulfilled, and rejected. Instead of using nested callbacks, you chain .then() and .catch() for cleaner logic. This avoids \u201ccallback hell\u201d and makes error handling easier.<\/p>\n\n\n\n<ol start=\"9\">\n<li><strong>What is the difference between Map and WeakMap in JavaScript?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Map allows keys of any type and keeps strong references. It supports size, iteration, and various methods.&nbsp;<\/p>\n\n\n\n<p>WeakMap only accepts objects as keys and holds weak references, meaning keys can be garbage collected. WeakMap is not iterable.<\/p>\n\n\n\n<ol start=\"10\">\n<li><strong>What are proxies in ES6 and when would you use them?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Proxies let you control how objects behave. You can intercept actions like reading or writing properties. They are useful for validation, logging, or custom access behavior.<\/p>\n\n\n\n<p>Example: hiding internal values or creating fallback responses.<\/p>\n\n\n\n<ol start=\"11\">\n<li><strong>What are generator functions and how do they differ from regular functions?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Generator functions use the function* syntax and return an iterator object. You can pause their execution using yield and resume it later. Unlike regular functions, which run from start to finish, generators allow you to manage sequences, lazy evaluation, and complex control flows more efficiently.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ES6_Features_Interview_Questions\"><\/span>ES6 Features Interview Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are some key ES6 features in JavaScript interview questions to test your understanding of modern syntax and functionality.<\/p>\n\n\n\n<ol start=\"12\">\n<li><strong>What are the most important features introduced in ES6?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>ES6 added key features like let, const, arrow functions, classes, template literals, destructuring, default and rest parameters, promises, modules, and the spread operator. These changes made JavaScript more modern and easier to write.<\/p>\n\n\n\n<ol start=\"13\">\n<li><strong>How do default parameters work in ES6 functions?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Default parameters let you assign fallback values to function arguments. If no value is passed or it&#8217;s undefined, the default kicks in.<\/p>\n\n\n\n<p><strong>Example:<\/strong><\/p>\n\n\n\n<p>function greet(name = &#8216;Guest&#8217;) { return `Hello, ${name}` }&nbsp;&nbsp;<\/p>\n\n\n\n<ol start=\"14\">\n<li><strong>What is the rest parameter in ES6 and how is it different from arguments?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The rest parameter (&#8230;args) collects remaining arguments into an array. It is cleaner and supports array methods directly.<\/p>\n\n\n\n<p>Unlike arguments, rest parameters don\u2019t include non-passed parameters and don\u2019t work in arrow functions.<\/p>\n\n\n\n<ol start=\"15\">\n<li><strong>How does ES6 support object-oriented programming with classes and inheritance?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>ES6 introduced class syntax to define constructors and methods. You can use extends to inherit from a parent class and super() to call the parent constructor. It made OOP feel more structured and closer to other languages.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ES6_Coding_Interview_Questions\"><\/span>ES6 Coding Interview Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are practical ECMAScript interview questions that test your ability to write and understand real ES6 code in JavaScript interviews.<\/p>\n\n\n\n<ol start=\"16\">\n<li><strong>Write a function using arrow syntax that adds two numbers.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>const add = (a, b) =&gt; a + b;<\/p>\n\n\n\n<p>console.log(add(3, 5)); \/\/ Output: 8<\/p>\n\n\n\n<ol start=\"17\">\n<li><strong>Write an ES6 function that swaps two variables using destructuring.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>let x = 10, y = 20;<\/p>\n\n\n\n<p>[x, y] = [y, x];<\/p>\n\n\n\n<p>console.log(x, y); \/\/ Output: 20 10<\/p>\n\n\n\n<ol start=\"18\">\n<li><strong>Write an example using the spread operator to merge two arrays.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>const arr1 = [1, 2, 3];<\/p>\n\n\n\n<p>const arr2 = [4, 5, 6];<\/p>\n\n\n\n<p>const merged = [&#8230;arr1, &#8230;arr2];<\/p>\n\n\n\n<p>console.log(merged); \/\/ Output: [1, 2, 3, 4, 5, 6]<\/p>\n\n\n\n<ol start=\"19\">\n<li><strong>Create a simple class in ES6 with a constructor and a method.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>class Person {<\/p>\n\n\n\n<p>&nbsp;&nbsp;constructor(name) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;this.name = name;<\/p>\n\n\n\n<p>&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;greet() {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;return `Hi, I&#8217;m ${this.name}`;<\/p>\n\n\n\n<p>&nbsp;&nbsp;}<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>const user = new Person(&#8216;Alice&#8217;);<\/p>\n\n\n\n<p>console.log(user.greet()); \/\/ Output: Hi, I&#8217;m Alice<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tips_to_Prepare_for_ES6_JavaScript_Interview_Questions\"><\/span>Tips to Prepare for ES6 JavaScript Interview Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>ES6 is a core part of modern JavaScript interviews and often tests real coding ability. Here are some tips to answer ES6 interview questions.&nbsp;<\/p>\n\n\n\n<ul>\n<li>Practice writing code with let, const, arrow functions, and destructuring<\/li>\n\n\n\n<li>Understand how promises and async code work<\/li>\n\n\n\n<li>Build small apps using ES6 classes and modules<\/li>\n\n\n\n<li>Read code on GitHub to see ES6 in action<\/li>\n\n\n\n<li>Use online tools like JSFiddle or CodePen to test concepts quickly and interactively<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-verse\"><strong>Also Read - <a href=\"https:\/\/www.hirist.tech\/blog\/top-40-javascript-interview-questions-answers-2024-hirist\/\" target=\"_blank\" rel=\"noreferrer noopener\">Top 60+ JavaScript Interview Questions and Answers<\/a><\/strong><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Wrapping_Up\"><\/span>Wrapping Up<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>So, these are the 15+ most asked ES6 interview questions that can help you prepare better. Make sure to practice coding regularly and understand how ES6 works in real projects. It is a must-know for JavaScript roles today.<\/p>\n\n\n\n<p>Looking for ES6 <a href=\"https:\/\/www.hirist.tech\/k\/es6-jobs?ref=blog\" target=\"_blank\" rel=\"noreferrer noopener\">JavaScript roles? <\/a>Find top tech openings on Hirist today.\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1754043987494\"><strong class=\"schema-faq-question\"><strong>What are the most asked ES5 and ES6 interview questions?<\/strong><\/strong> <p class=\"schema-faq-answer\">These questions are often asked to test your core understanding of JavaScript syntax and behavior.<br\/>What is the difference between var, let, and const?<br\/>How is hoisting handled in ES5 vs ES6?<br\/>What are arrow functions and how are they different?<br\/>What is the purpose of the class keyword in ES6?<br\/>Explain the difference between function and function*.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1754044000199\"><strong class=\"schema-faq-question\"><strong>What are the basic ES6 interview questions?<\/strong><\/strong> <p class=\"schema-faq-answer\">These are beginner-level questions to check your knowledge of ES6 features.<br\/>What is the use of template literals in ES6?<br\/>How does destructuring work in arrays and objects?<br\/>What is the difference between Map and Object?<br\/>What are default parameters and how do they work?<br\/>How does the for&#8230;of loop work in ES6?<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1754044010464\"><strong class=\"schema-faq-question\"><strong>What is the difference between ES6 and JavaScript?<\/strong><\/strong> <p class=\"schema-faq-answer\">JavaScript is the overall programming language used for web development. ES6, or ECMAScript 2015, is a major update to JavaScript that introduced modern syntax and new features like classes, modules, and arrow functions.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1754044030279\"><strong class=\"schema-faq-question\"><strong>What are the latest features of ES6?<\/strong><\/strong> <p class=\"schema-faq-answer\">ES6 introduced useful features such as let, const, arrow functions, template literals, destructuring, promises, classes, modules, and the spread\/rest operators. These changes made JavaScript cleaner, more readable, and suitable for larger applications.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1754044040877\"><strong class=\"schema-faq-question\"><strong>What are the three dots in ES6?<\/strong><\/strong> <p class=\"schema-faq-answer\">The three dots (&#8230;) in ES6 represent both the spread and rest operators. Spread is used to expand arrays or objects into individual elements, while rest collects multiple function arguments into a single array.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1754044047969\"><strong class=\"schema-faq-question\"><strong>What is the average salary for JavaScript developers with ES6 skills in India?<\/strong><\/strong> <p class=\"schema-faq-answer\">According to AmbitionBox, JavaScript developers with ES6 skills earn between \u20b91.8 Lakh to \u20b915 Lakhs annually, depending on experience. The average salary is around \u20b96.3 Lakhs per year, with monthly in-hand pay ranging from \u20b934,000 to \u20b935,000 for many developers.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1754044093566\"><strong class=\"schema-faq-question\"><strong>Which companies hire JavaScript developers with ES6 skills?<\/strong><\/strong> <p class=\"schema-faq-answer\">Many tech companies hire JavaScript developers with ES6 skills, including TCS, Infosys, Accenture, Cognizant, Wipro, and growing startups. Product-based companies and IT firms also seek candidates with strong ES6 and JavaScript skills for frontend roles.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>ES6 stands for ECMAScript 2015. It was a major update that made JavaScript more powerful&hellip;<\/p>\n","protected":false},"author":1,"featured_media":7485,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,29,19],"tags":[32,34,56,33],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Top 15+ ES6 Interview Questions and Answers - Hirist Blog<\/title>\n<meta name=\"description\" content=\"Prepare top ES6 interview questions covering ES6 features\u2014arrow functions, promises, destructuring, let\/const, modules &amp; template literals.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hirist.tech\/blog\/top-15-es6-interview-questions-and-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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