How to answer a senior frontend interview question on currying

Polyfills in JavaScript – An Interview Favorite A polyfill is just a piece of JS code that adds support for a feature not available in certain browsers.  Think: writing your own includes(), bind(), or even Promise.all() when the browser doesn’t provide it. Why interviewers love this topic: - Tests your grasp of core JS fundamentals. - Shows you understand cross-browser compatibility issues. - Often comes as a “write a polyfill for X” coding exercise. - Great way to show problem-solving depth by re-implementing JS features from scratch. Common polyfill interview exercises: - Array methods: map, filter, forEach - Function methods: bind, call, apply - Promise utilities: Promise.all, Promise.race I’ve also compiled a detailed set of polyfill implementations here: https://lnkd.in/ggGEVfwg https://lnkd.in/giFkJTe6 Have you ever been asked to implement a polyfill in an interview?  Would love to hear which one! 👇 #JavaScript #Frontend #InterviewPrep #Coding #WebDevelopment

🚀 Master JavaScript Interviews Like a Pro! Just went through a powerful guide — Top 50 JavaScript Interview Questions & Answers! From concepts like closures, event loop, async/await, to DOM manipulation and ES6 features — this PDF covers everything you need to crack your next frontend or full-stack interview 💻🔥 📘 Topics Covered: ✅ Core JavaScript concepts ✅ Promises, Async/Await ✅ DOM, CORS, WebSockets ✅ Performance Optimization Tips If you’re preparing for JavaScript interviews, this is your go-to resource! 💬 Comment “JS” if you’d like a copy or want me to share key takeaways from it! #JavaScript #WebDevelopment #Frontend #InterviewPrep #Coding

Are you preparing for a JavaScript interview and got stuck on tricky questions like: console.log(false == []); // true console.log(false == ![]); // true 🤔 Why does this happen? The secret lies in JavaScript type coercion, truthy & falsy values, and the == operator. In this video, I’ll explain step by step: ✅ Why false == [] is true ✅ Why false == ![] is also true ✅ The difference between == and === in JavaScript ✅ How interviewers use these questions to test your deep JS knowledge 👉 Watch till the end to master JavaScript tricks and crack your coding interview! 🚀 📌 More Videos Coming on: JavaScript tricky questions Frontend interview preparation Type coercion & equality in JS #JavaScript #JavaScriptInterview #WebDevelopment #CodingInterview #JavaScriptTricks #FrontendDeveloper #JSQuestions #LearnJavaScript #CodingTips #100DaysOfCode #Programming

Latest JavaScript Output-Based Questions — 2025 Edition If you’re preparing for Frontend or JavaScript interviews, these tricky output-based questions will test your real understanding — not just syntax memorization. They challenge how well you grasp concepts like: 🧠 Type coercion ⚙️ Hoisting ⏳ Async behavior 🔒 Closures 📦 Scopes & memory references #JavaScript   #WebDevelopment   #Frontend   #FrontendDeveloper   #CodingInterview   #InterviewPreparation  

Hello I am Ayush Fareliya Currently preparing for JavaScript interviews with a focus on fundamentals, asynchronous JS, and React concepts. My plan is to strengthen core topics like closures, this, promises, async/await, and the event loop, practice coding problems (arrays, strings, map/filter/reduce, DSA basics), and revise React hooks & optimization. My goal is to showcase clean code, clear explanations, and strong problem-solving skills in upcoming interviews. If you have any great resources or tips, please share #JavaScript #Frontend #InterviewPrep #MERN #React

🧠 React interviews aren’t meant to trick you — they’re meant to test how well you understand the fundamentals of React beyond the docs.!! If you can’t answer these React interview questions, your next technical rounds might be tougher than you think. I’m compiling these set of real React interview + coding questions that reveal how deeply you think in React, not how fast you recall syntax in the given below doc. 🔖 Save this post & find the list below👇 Follow me: - Parthib M. 🐺 to explore more updates on Web Development. 🔍 Credit: AlgoTutor #ReactJS #FrontendDevelopment #CodingInterviews #WebDev #JavaScript #ReactDeveloper #TechCommunity

There are certain CSS selector patterns that, when used thoughtfully, can make your designs stand out from the crowd. .main p ==> selects all the paragraph text inside the main class whether direct child or nested say ( .main div p ) .main > p ==> Selects only the direct child and does not affect the nested child .main + p ==> Selects immediately next sibling ( Sibling means at the same level ) .main ~ p ==> Selects all the following siblings after .light These selector patterns are usually asked during a mid level interviews. #FrontendDeveloper #reactjs #javascript #css #selectors #selectorpattern #webdevelopment #interviewquestions #developers #stylesheets

🚀 Important JavaScript Interview Questions Every Developer Should Know Whether you're preparing for a new role or brushing up your skills, mastering JavaScript fundamentals is a must. Here are some key topics that often come up in interviews: ✅ Hoisting, Scope & Closures ✅ Event Loop & Asynchronous JS (Promises, async/await) ✅ Callbacks vs Promises vs Observables ✅ Prototypes & Inheritance ✅ this Keyword behavior ✅ DOM Manipulation & Event Handling ✅ ES6+ Features (Destructuring, Spread, Modules) ✅ Debouncing & Throttling ✅ Error Handling in JS ✅ Common Array & String methods used in problem-solving 🧠 These aren’t just interview questions—they form the core of writing efficient, clean, and scalable code. Which of these topics do you find most challenging or interesting? Share in the comments 👇 #JavaScript #Angular #NodeJS #SoftwareDeveloper #WebDevelopment #FrontendDeveloper #CodingInterview #TechCareer #Programming #DeveloperLife #LearnJavaScript

🤯 This is one of the hardest questions for Senior Frontend Folks - Implement Polyfill for Async Await in JavaScript, Do you know? We have recently published another post at FrontendGeek.com that covers this hard JavaScript interview question - "Polyfill for Async Await in JavaScript" Link - https://lnkd.in/dCWtSTnn 🚀 What does it cover? We have covered below, with a step-by-step explanation for Async Await 1️⃣ Understand how the function works 2️⃣ Expected behaviour of the function AKA test cases 3️⃣ Polyfill code for the function 4️⃣ Step-by-step explanation of polyfill code ✴️ Check out the post and share your thoughts in the comments🧑💻 --- ✅ Check out FrontendGeek.com to prepare for all rounds of Frontend Interviews with the best curated resources for free. 🚀 Follow Anuj Sharma & FrontendGeek to stay tuned with Frontend Interview preparation tips, development & jobs-related stuff #frontend #interview #polyfills #frontendinterview #javascript #js #reactjs #preparation #questions #frontendgeek #javascriptinterview #javascriptquestions

⚡ JavaScript Interview Q&A - Must-Know for Every Developer. JavaScript is the heart of web development ❤️ … but interviews can get tricky! Here’s a collection of the most important JavaScript Interview Q&A to help you crack your next interview 💡 Whether you’re preparing for your first frontend role or aiming for a senior developer position, these Q&A will boost your confidence. ♻️ Repost to help others. 🔔 Follow Prince Kushwaha for more AI & tech insights! #JavaScript #WebDevelopment #Frontend #InterviewPreparation