Preventing Memory Leaks in JavaScript with WeakMap

🚀 Polyfills in JavaScript Ever faced this? 😵 👉 Code works perfectly in Chrome 👉 But breaks in older browsers Let’s fix that 👇 🧠 What is a Polyfill? 👉 A polyfill is a piece of code that adds support for modern JavaScript features in older browsers ⚡ Why do we need it? 👉 Not all browsers support new features 👉 Polyfills help bridge that gap 💡 Example: 👉 Modern method: Array.prototype.includes() ❌ Not supported in older browsers 🛠️ Solution: 👉 We create our own version (polyfill) 👉 So older browsers can also use it 🔥 Key Understanding: 👉 If a feature doesn’t exist 👉 We write our own implementation ⚡ Where is it used? ✔ Babel ✔ core-js ✔ Legacy browser support 🚨 Important Note: 👉 Polyfills increase bundle size 👉 Use only when needed 💡 One line to remember: 👉 “Polyfill = Backward compatibility for modern JavaScript” 💬 Did you know this before? 📌 Save this for interviews (very important concept) #javascript #webdevelopment #frontend #coding #programming #javascriptdeveloper #learncoding #developers #100DaysOfCode

JavaScript has a lot of tricky questions, and one of my favorites is this one 👇 console.log([] == ![]) Most developers expect this to be false. But the actual output is: true Why? Step 1: ![] becomes false Because in JavaScript, an empty array is truthy. Step 2: Now the comparison becomes [] == false Step 3: JavaScript converts both values during loose equality comparison false becomes 0 [] becomes "" Then: "" becomes 0 Final comparison: 0 == 0 That’s why the result is true. This is a perfect example of why == can create unexpected results. That’s also why many developers prefer using === for safer and more predictable comparisons. JavaScript is powerful, but type coercion can be surprisingly tricky. Have you seen a stranger JS behavior than this one? 😄 #JavaScript #FrontendDevelopment #WebDevelopment #Programming #SoftwareEngineering #JSInterview #ReactJS

Just built a Todo App using Vanilla JavaScript! Key Features: ->Add, edit and delete tasks dynamically ->Reorder tasks with up/down buttons ->Persistent storage using localStorage ->Auto-display of tasks with date & time ->Efficient event handling using event delegation This project helped me strengthen my DOM manipulation, JavaScript logic, and web storage skills. Todo Website: https://lnkd.in/e6y7QmAb Check it out on GitHub: https://lnkd.in/eQjqyHwh #JavaScript #WebDevelopment #Frontend #TodoApp #Coding

𝗪𝗵𝘆 𝗬𝗼𝘂 𝗦𝗵𝗼𝘂𝗹𝗱 𝗦𝘁𝗼𝗽 𝗠𝘂𝘁𝗮𝘁𝗶𝗻𝗴 𝗔𝗿𝗿𝗮𝘆𝘀 𝗶𝗻 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 (𝘚𝘦𝘳𝘪𝘰𝘶𝘴𝘭𝘺) 🧐 If you’ve been writing JavaScript for a while, you’ve probably spent hours debugging a feature that simply refused to update on the screen, only to realize the data had changed, but the app didn’t know it. #javascript #WebDevelopment #FullStackDeveloper

⚠️ JavaScript Arrays: Mutating vs Non-Mutating Quick thing that caused me way too many bugs before I really paid attention to it 👇 Some array methods actually change the original array… and some don’t. 🧠 Mutating → they modify the same array ✨ Non-mutating → they give you a new one instead Sounds simple, but here’s where it gets tricky… I used to assume my original data was “safe”, then suddenly something else in the app behaved weirdly — turns out I had already changed that array without realizing it. The tricky part is that mutations aren’t always obvious at first. You might only notice later when something behaves differently than expected. This becomes even more important when working with state (like in React), where consistency really matters. Not a big concept… but it makes a big difference. #JavaScript #WebDev #FrontendDevelopment #ReactJS #CodingTips #ProgrammingTips

💡 #JavaScript Global vs Local Variables (Simple Explanation) If you're learning JavaScript, understanding variable scope is a must 👇 🔹 Global Variables Declared outside any function Accessible from anywhere in your code Can be used across multiple functions Example: var name = "Avi"; function greet() { console.log(name); // Accessible here } 🔹 Local Variables Declared inside a function or block Accessible only within that function/block Helps avoid unwanted changes from outside Example: function greet() { var message = "Hello"; console.log(message); // Works here } console.log(message); // ❌ Error ⚡ Key Difference Global = accessible everywhere Local = accessible only inside its scope 👉 Tip: Prefer #local variables to keep your code clean and avoid bugs. Use #global where multiple parts of your app need the same value. #frontend #js #javascript

💡 JavaScript Basics That Still Confuse Many Developers… Let’s break down a classic: Function Declaration vs Function Expression 👇 🔹 Function Declaration function greet() { console.log("Hello!"); } ✔ Hoisted (you can call it before it’s defined) ✔ Cleaner and easier to read 🔹 Function Expression const greet = function() { console.log("Hello!"); }; ✔ Not hoisted (must be defined before use) ✔ More flexible (can be anonymous, used in callbacks, etc.) 🚀 Key Difference: Function declarations are available throughout the scope, while function expressions behave like variables. 📌 Pro Tip: Prefer function expressions (especially arrow functions) in modern JavaScript for better control and predictability. #JavaScript #WebDevelopment #CodingBasics #Frontend #LearnToCode

🚀 Day 979 of #1000DaysOfCode ✨ 4 Useful Number Functions in JavaScript (With Cool Examples) JavaScript provides many built-in number utilities — but most developers only use a few of them. In today’s post, I’ve shared 4 super useful number functions in JavaScript along with some cool and practical examples for each. These functions can help you handle number validation, formatting, and edge cases more effectively in real-world applications. Small utilities like these might look simple, but they can save you time and help you write cleaner and more reliable logic. Once you start using them properly, you’ll notice how often they come in handy while working with data. If you work with numbers, calculations, or user inputs in JavaScript, these functions are definitely worth knowing. 👇 Which JavaScript number function do you use the most in your projects? #Day979 #learningoftheday #1000daysofcodingchallenge #FrontendDevelopment #WebDevelopment #JavaScript #React #CodingCommunity #JSDevelopers

As a developer, I’ve noticed some small things… but they matter a lot 👨💻 1. Console Errors Even When Feature Works Sometimes our JavaScript/jQuery code works perfectly on UI… but the console still shows errors or warnings. 👉 Real examples: `undefined is not a function` but the feature still runs partially Deprecated jQuery methods showing warnings API error in console but UI shows cached/old data 💡 Lesson: Even if it “works”, ignoring console errors can create bigger issues later. --- 2. Works in Chrome, Breaks in Other Browsers We often test only in Chrome… and everything looks perfect 😄 But in other browsers or app web views, things break. 👉 Real examples: CSS flexbox/layout breaking in Safari New JS features not supported in older browsers Different font or spacing issues across browsers 💡 Lesson: A good developer doesn’t just make it work… They make it work everywhere. --- 🚀 Still learning, but these are things I’m experiencing in real projects. #JavaScript #Frontend #Debugging #LearningInPublic #DeveloperJourney #SoftwareEngineering

#Day21 JavaScript just got a whole lot more interesting. Up until now, everything I wrote lived in the browser. Today I started working with Node.js and the fs module and for the first time, my code started talking to my computer directly. Three things clicked today: => Reading a file: "fs.readFile" opens a file sitting on your computer and prints its contents. That's it. No browser, no UI, just my code and my file system having a conversation. => Writing a file: "fs.writeFile" creates a brand new file and puts text inside it. If the file doesn't exist yet, Node creates it for you. One line of code does what used to feel like a whole process. => Appending to a file: "fs.appendFile" adds new content to an existing file without deleting what's already there. It runs after the file is created because in Node, async operations happen in sequence through callbacks. => process.on('uncaughtException'): Ending today with "process.on", this is a safety net. Instead of your program crashing with no explanation, it catches the error, tells you what went wrong, and shuts down cleanly. JavaScript isn't just a browser language. With Node.js, you can read files, write files, manage your system, and build backends all with the same language you already know. Same language. Bigger world. #NodeJS #JavaScript #M4ACELearningChallenge #BackendDevelopment #LearningToCode #WebDevelopment