Flatten Arrays with JavaScript's flat() Function

#4 Currying in JavaScript: When it actually pays off Currying looks weird at first, but it solves a very practical problem: reuse. Currying is one of those JavaScript patterns that feels unusual at first, but it can make your code much more flexible. Instead of passing all arguments at once, you pass them one by one: f(a)(b)(c). That makes it easier to reuse functions when some values stay the same and others change often. Here’s the link to the post: https://lnkd.in/dkhKsRYa #javascript #react #node #interview

Day 11 of my React Interview Series Today’s topic: Asynchronous Functions vs Promises — and their key differences in JavaScript. Understanding how async/await builds on top of Promises is essential for writing clean, scalable React applications and handling real-world API flows smoothly. One step closer to mastering frontend interview #ReactJS #JavaScript #WebDevelopment #FrontendDevelopment #CodingInterview #MERNStack #AsyncAwait #Promises #100DaysOfCode #ReactInterview #SoftwareEngineering

Day 17 of My Frontend Interview Preparation 🚀 Today I focused on one of the most important concepts in JavaScript — Prototype & Prototype Chaining. I learned how every object in JavaScript has a hidden link to another object (its prototype), and how JavaScript uses this chain to access properties and methods. This really helped me understand how things like arrays, functions, and objects share common behavior behind the scenes. Also cleared my confusion between __proto__ vs prototype — now it finally makes sense where each one is used 🙌 Along with this, I practiced several output-based questions, which helped me strengthen my understanding of tricky concepts and edge cases. 📌 Key Takeaways: How prototype works internally What is prototype chaining Difference between __proto__ and .prototype Improving problem-solving with output-based questions Slowly building strong fundamentals, one day at a time 💪 #Day17 #JavaScript #FrontendDevelopment #InterviewPreparation #WebDevelopment #CodingJourney

One of the interesting questions asked in my interview was: ❓ “What are Microtasks and Macrotasks in JavaScript?” 💠 Understanding the Concept 🔹 JavaScript uses an event loop to handle asynchronous operations. 📌 Tasks are mainly divided into: 👉 Micro tasks : 🔹 High priority tasks 🔹 Executed immediately after the current synchronous code 🔹 Processed before macrotasks ✅ Examples: 🔹 Promise.then() 🔹 catch, finally 🔹 queueMicrotask() 👉 Macro tasks : 🔹 Lower priority compared to microtasks 🔸 Executed after microtasks queue is empty ✅ Examples: 🔹 setTimeout() 🔹 setInterval() 🔹 setImmediate() (Node.js) 🔄 Execution Order 🔹 Run synchronous code 🔹 Execute all microtasks 🔹 Execute one macrotask 🔹 Repeat This question tests understanding of Event loop, Asynchronous behavior and Execution order in JavaScript #JavaScript #EventLoop #AsyncProgramming #InterviewPrep #WebDevelopment #Learning #frontend #interviewExxperiance #interview

🔒 Advanced JavaScript — Day 5: Scope, Execution Context & Closures Today I studied one of the most important — and most misunderstood — concepts in all of JavaScript. Closures. I've heard this word thrown around in interviews, tutorials, and job descriptions for months. Today I finally sat down, understood it deeply, and built a real project using it: a fully configurable Toast Notification system. Here's everything I covered 👇 📌 Scope — Where Variables Live 📌 Execution Context & the Scope Chain 📌 Closures — The Real Magic 🪄 📌 The Toast Project — What It Does 📌 Why Closures Matter in Real Development Today was one of those days where a concept that seemed complex finally clicked completely. Closures aren't magic. They're just functions that remember where they came from. Day 6 tomorrow. The streak continues. 🔥 #AdvancedJavaScript #JavaScript #Closures #Scope #ExecutionContext #100DaysOfCode #LearnInPublic #WebDevelopment #Frontend #CodingJourney #BuildInPublic #ProjectBased #TechLearning

One of the most common JavaScript interview questions: "Why does setTimeout with 0ms delay not run immediately?" Most developers cannot answer this correctly. Here is the full explanation: JavaScript is single-threaded. It can only do one thing at a time. The Event Loop is how it manages everything else. The execution order is always the same: 1 — Synchronous code runs first All regular code on the Call Stack executes immediately. 2 — Microtasks run second Promises, async/await — these run before anything else once the Call Stack is empty. 3 — Macrotasks run last setTimeout, setInterval, DOM events — these wait until ALL microtasks are done. This is why setTimeout with 0ms still runs after a Promise. The Promise is a microtask. setTimeout is a macrotask. Microtasks always win. Understanding this prevents real bugs in production — async state updates, race conditions, unexpected render order. Save this post for your next async debugging session. Have you ever been confused by JavaScript async order? Drop a comment below. #JavaScript #WebDevelopment #Frontend #SoftwareEngineering #AsyncJavaScript

HOW DEFER SCRIPT LOADING WORK IN JAVASCRIPT ? SEE DIAGRAM Test your JavaScript fundamentals with output-based interview questions focused on scope, hoisting, closures, and asynchronous behavior. 💬 Share your answer or reasoning in the comments. #JavaScript #InterviewPreparation #SoftwareEngineering #WebDevelopment #DevelopersOfLinkedIn #frontend #backend #coding #learning