--- title: The most failed JavaScript interview questions | daily.dev description: Learn about some common JavaScript interview questions, including topics such as the event loop, variable scope, and ES6 modules. canonical: https://daily.dev/posts/the-most-failed-javascript-interview-questions-tca72oncc twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: The most failed JavaScript interview questions | daily.dev og:description: Learn about some common JavaScript interview questions, including topics such as the event loop, variable scope, and ES6 modules. og:url: https://daily.dev/posts/the-most-failed-javascript-interview-questions-tca72oncc og:image: https://api.daily.dev/og/posts/tCa72oNcC.png og:image:alt: The most failed JavaScript interview questions og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # The most failed JavaScript interview questions **[Medium](https://daily.dev/sources/medium_js)** · 9 min read · 226 upvotes · 12 comments ## Summary Learn about some common JavaScript interview questions, including topics such as the event loop, variable scope, and ES6 modules. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@prince1456** · 8 upvotes > Summary if you like > The Most Failed JavaScript Interview Questions" by IntSpirit, discusses some of the most commonly failed JavaScript interview questions. The author argues that these questions are important for aspiring web developers to understand, as they reflect core concepts of the language. > > The first question discussed is about the difference between null and undefined. The author explains that null is an intentional absence of value, while undefined means that a value is not assigned. They suggest that interviewees should have a clear understanding of the distinction between these... **@luci02** · 6 upvotes > Can u share the most asked questions in javascript interview I'm preparing for interview now.. **@kyoukhana** · 5 upvotes > If you have a few companies you have worked at and many years of experience. JavaScript interview questions are a waste of time. These tests don't determine if your a good programmer or not **@bonaogeto** · 2 upvotes > Here is a great series of JavaScript basics tutorials. I’ll appreciate it if someone takes the initiative to submit them here > > https://hojaleaks.com/series/javascript-101 **@bendevweb** · 1 upvotes > Super helpful for my interview on Monday 👍 ## Similar posts on daily.dev - [Don’t just attend KubeCon \+ CloudNativeCon, Merge Forward your experience\!](https://daily.dev/posts/don-t-just-attend-kubecon-cloudnativecon-merge-forward-your-experience--l0rpp73x8) · CNCF · 1 upvotes · 0 comments - [Announcing H2 2026 KCDs](https://daily.dev/posts/announcing-h2-2026-kcds-m96goajm1) · CNCF · 1 upvotes · 0 comments - [Two months of Open Community Groups](https://daily.dev/posts/two-months-of-open-community-groups-asf52zhbs) · CNCF · 0 upvotes · 0 comments --- Tags: [#javascript](https://daily.dev/tags/javascript), [#interview-questions](https://daily.dev/tags/interview-questions) [View this post on daily.dev](https://daily.dev/posts/the-most-failed-javascript-interview-questions-tca72oncc) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"The most failed JavaScript interview questions","url":"https://daily.dev/posts/the-most-failed-javascript-interview-questions-tca72oncc","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/the-most-failed-javascript-interview-questions-tca72oncc"},"datePublished":"2023-03-10T13:31:49.513Z","dateModified":"2024-04-15T13:29:33.722Z","description":"Learn about some common JavaScript interview questions, including topics such as the event loop, variable scope, and ES6 modules.","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/f52f1320d3afa4719c59e29a6194fffc?_a=AQAEufR","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/f52f1320d3afa4719c59e29a6194fffc?_a=AQAEufR","isAccessibleForFree":true,"articleSection":"Medium","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":12,"discussionUrl":"https://daily.dev/posts/the-most-failed-javascript-interview-questions-tca72oncc","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":226},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":12}],"keywords":"javascript,interview-questions","timeRequired":"PT9M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"The most failed JavaScript interview questions"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/the-most-failed-javascript-interview-questions-tca72oncc","comment":[{"@type":"Comment","text":"Summary if you like\nThe Most Failed JavaScript Interview Questions" by IntSpirit, discusses some of the most commonly failed JavaScript interview questions. The author argues that these questions are important for aspiring web developers to understand, as they reflect core concepts of the language.\nThe first question discussed is about the difference between null and undefined. The author explains that null is an intentional absence of value, while undefined means that a value is not assigned. They suggest that interviewees should have a clear understanding of the distinction between these two values.\nThe second question concerns JavaScript’s hoisting mechanism, which allows developers to use functions and variables before they are declared. The author emphasizes the importance of understanding the scope of variables and how hoisting can impact their behaviour.\nThe third question asks about the difference between synchronous and asynchronous code execution. The author explains that synchronous code executes in a sequential manner, while asynchronous code allows for non-blocking execution. They suggest that candidates should have a good understanding of how to use callbacks, promises, and async/await to manage asynchronous code.\nThe fourth question discussed is about the “this” keyword in JavaScript, which can be confusing due to its dynamic binding. The author recommends that interviewees should have a clear understanding of how “this” works in different contexts, such as with arrow functions or within object methods.\nFinally, the article covers some additional tips for preparing for JavaScript interviews, such as practicing coding challenges and understanding common data structures and algorithms. The author emphasizes that while these questions may seem daunting, a strong understanding of these concepts will help candidates succeed in their interviews and become better developers overall.","datePublished":"2023-03-10T18:45:57.504Z","url":"https://daily.dev/posts/tCa72oNcC#c-F0WXkebVh","author":{"@type":"Person","name":"Ali","url":"https://daily.dev/prince1456","image":"https://avatars.githubusercontent.com/u/20523380?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":8}},{"@type":"Comment","text":"Can u share the most asked questions in javascript interview I’m preparing for interview now…","datePublished":"2023-03-10T14:05:38.997Z","url":"https://daily.dev/posts/tCa72oNcC#c-Ps5ZCCUBG","author":{"@type":"Person","name":"sakthi_l_u_c_i","url":"https://daily.dev/luci02","image":"https://avatars.githubusercontent.com/u/81083482?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":6}},{"@type":"Comment","text":"If you have a few companies you have worked at and many years of experience. JavaScript interview questions are a waste of time. These tests don’t determine if your a good programmer or not","datePublished":"2023-03-10T16:06:32.270Z","url":"https://daily.dev/posts/tCa72oNcC#c-7jTFS6tLf","author":{"@type":"Person","name":"Kevin","url":"https://daily.dev/kyoukhana","image":"https://avatars2.githubusercontent.com/u/756849?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":5}},{"@type":"Comment","text":"Here is a great series of JavaScript basics tutorials. I’ll appreciate it if someone takes the initiative to submit them here\nhttps://hojaleaks.com/series/javascript-101","datePublished":"2023-04-16T12:19:43.177Z","url":"https://daily.dev/posts/tCa72oNcC#c-S6fxA9sGH","author":{"@type":"Person","name":"Bonaventure Ogeto","url":"https://daily.dev/bonaogeto","image":"https://avatars.githubusercontent.com/u/39027629?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2}},{"@type":"Comment","text":"Super helpful for my interview on Monday 👍","datePublished":"2023-03-11T21:50:34.933Z","url":"https://daily.dev/posts/tCa72oNcC#c-sKkwlydfE","author":{"@type":"Person","name":"Ben Devweb","url":"https://daily.dev/bendevweb","image":"https://avatars.githubusercontent.com/u/88207582?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}}]} ```