How to cancel a setTimeout in JavaScript with clearTimeout

Day 10 of #30DaysOfJavaScript on LeetCode Today's Challenge: 2666 — Allow One Function Call Today’s problem was all about controlling function execution — ensuring that a given function runs only once, no matter how many times it’s called afterward. Here’s my solution 👇 var once = function(fn) { let called = false; return function (...args) { if (!called) { called = true; return fn(...args); } }; }; This challenge reinforces the importance of closures in JavaScript — allowing us to preserve state (called) between function invocations. It’s a simple yet powerful example of how closures give us fine-grained control over function behavior. Try it out here: https://lnkd.in/g6WC5mu7 #JavaScript #LeetCode #CodingChallenge #LearningJourney #30DaysOfCode #Closures #Functions #Programming #Developers #Learning

Unleash the Potential of Array Methods!** Stop writing verbose loops! JavaScript Array methods like `map`, `filter`, and `reduce` are your secret weapons. Write cleaner, more readable, & more performant code. They're not just shorter; they're a whole new level of elegance. What's one Array method that changed the way YOU code? Share your experiences! 👇 #javascript #arrays #codingtips #webdev #programming

Day 16 of #30DaysOfJavaScript on LeetCode Today's Challenge: 2637 — Promise Time Limit Today’s challenge focused on controlling asynchronous execution using timeouts. The goal was to wrap any async function with a time limit — if the function doesn't finish in time, it should automatically reject with "Time Limit Exceeded". Here’s my solution: var timeLimit = function(fn, t) { return async function(...args) { const timeOutPromise = new Promise((_, reject) => setTimeout(() => reject("Time Limit Exceeded"), t) ) return Promise.race([fn(...args), timeOutPromise]) } } Try it out here: https://lnkd.in/g6WC5mu7 This exercise helped me understand how to combine Promise.race() with timeouts to enforce execution limits #JavaScript #LeetCode #CodingChallenge #AsyncAwait #Promises #30DaysOfCode #Programming #Developers #LearningJourney

Just published a beginner-friendly guide to understanding function binding in JavaScript! If you've ever wondered why `this` becomes undefined in callbacks, this article breaks it down with simple examples. Perfect for developers learning JavaScript or anyone who needs a refresher on bind() 💻 https://lnkd.in/dmAU3Rhc #JavaScript #WebDevelopment #Programming #Coding

Day 11 of #30DaysOfJavaScript on LeetCode Today's Challenge: 2623 — Memoize Today’s problem focused on performance optimization using memoization — a powerful technique to cache the results of expensive function calls and return the cached result when the same inputs occur again. Here’s my solution 👇 function memoize(fn) { const cache = {}; return function(...args) { const key = JSON.stringify(args); if (key in cache) { return cache[key]; } const result = fn(...args); cache[key] = result; return result; } } This challenge highlights how closures and object caching work together to optimize performance — especially useful for recursive functions like Fibonacci or factorial. By storing computed results, we avoid redundant calculations, making our functions significantly faster! Try it out here: https://lnkd.in/g6WC5mu7 #JavaScript #LeetCode #CodingChallenge #LearningJourney #30DaysOfCode #Memoization #Closures #Optimization #Programming #Developers #Learning

Day 9 of #30DaysOfJavaScript on LeetCode Today's challenge: 2703 — Return Length of Arguments Passed The task was to write a function that returns the number of arguments passed to it — a simple yet elegant problem to explore rest parameters in JavaScript. Here’s my solution 👇 var argumentsLength = function(...args) { return args.length; }; It’s a short problem but a great reminder that even small concepts like this are essential for mastering function flexibility in JavaScript! Try it out here : https://lnkd.in/g6WC5mu7 #JavaScript #LeetCode #CodingChallenge #LearningJourney #30DaysOfCode #Functions #RestParameters #Programming

JavaScript Quirks Every Developer Should Know Understanding these "funny" behaviors isn't just entertaining it's essential for writing better code: - - Why [] == ![] is true (type coercion) - Why 0.1 + 0.2 ≠ 0.3 (floating-point precision) - Why sort() doesn't work as expected (alphabetical default) These quirks teach us valuable lessons about JavaScript's underlying mechanics. What JS behavior caught YOU off guard when you first started? Share your stories! #JavaScript #WebDevelopment #TechEducation #LearnToCode #Programming

Day 13 of #30DaysOfJavaScript on LeetCode Today's Challenge: 2621 — Sleep Today’s challenge explored the basics of asynchronous timing in JavaScript — creating a custom sleep() function that pauses execution for a given duration using promises. Here’s my solution 👇 async function sleep(millis) { return new Promise(resolve => setTimeout(resolve, millis)); } This simple problem reinforces how promises and setTimeout() work together to handle delays asynchronously. Understanding this helps build a solid foundation for mastering async behavior in JavaScript. Try it out here: https://lnkd.in/g6WC5mu7 #JavaScript #LeetCode #CodingChallenge #LearningJourney #30DaysOfCode #AsyncAwait #Promises #Programming #Developers #Learning