JavaScript Spread & Rest Operators: Examples & Use Cases

📌 Promises in JavaScript A Promise represents the eventual completion or failure of an asynchronous operation It has three states: pending, fulfilled, and rejected .then() handles successful outcomes .catch() handles errors Helps avoid callback hell and improves code readability 👉 Use case: API calls, asynchronous data handling #JavaScript #Promises #AsyncProgramming #WebDev #Coding

🚀 Day 955 of #1000DaysOfCode ✨ How JavaScript Event Loop Works Behind the Curtains JavaScript looks simple on the surface — but under the hood, a lot is happening to make async code work smoothly. In today’s post, I’ve explained how the JavaScript Event Loop actually works behind the scenes, so you can understand how tasks are executed, queued, and prioritized. From the call stack to the callback queue and microtask queue, this concept explains why some functions run before others — even when the code looks sequential. Understanding the event loop helps you debug tricky async issues, avoid unexpected behavior, and write more predictable code. If you’re working with promises, async/await, or APIs, this is one of those concepts you must truly understand. 👇 What part of the event loop confuses you the most — call stack, microtasks, or callbacks? #Day955 #learningoftheday #1000daysofcodingchallenge #FrontendDevelopment #WebDevelopment #JavaScript #React #CodingCommunity #AsyncJavaScript

Fixed a bug today that took hours to understand. API was fine. Frontend looked correct. But data wasn’t showing. Issue? A small mismatch in field names. Lesson: • Always verify API responses • Never assume things are correct Small bugs, big lessons. What did you debug recently? #FullStackDeveloper #WebDevelopment #JavaScript #Debugging #ProblemSolving

hi connections Day 16 of 30: Implementing a Promise Time Limit! Moving deeper into the Asynchronous section of my 30 Days of JavaScript on LeetCode. Today was about adding a "safety net" to our code. 🛠️⏳ The Goal: Wrap an async function so that if it takes longer than a specified time t, it immediately fails with a "Time Limit Exceeded" error. The Lesson: I used Promise.race() to pit the actual function against a custom timeout promise. This pattern is crucial for building resilient systems. Whether it's a web crawler or a high-traffic API, you never want one slow request to block your entire event loop. Control the time, control the performance! 💻🔥 #JavaScript #WebDevelopment #CodingChallenge #LeetCode #Day16 #SoftwareEngineering #AsyncJS #PerformanceOptimization

Day 12/100 of JavaScript 🚀 Today’s topic: async / await "async" and "await" provide a cleaner way to work with Promises and write asynchronous code that looks like synchronous code 📍Basic example async function getData() { const res = await fetch("https://lnkd.in/gCA7VyNQ"); const data = await res.json(); console.log(data); } 📍With error handling async function getData() { try { const res = await fetch("https://lnkd.in/gCA7VyNQ"); const data = await res.json(); console.log(data); } catch (err) { console.error(err); } } 🔑 Key points : - "async" makes a function return a Promise. - "await" pauses execution until the Promise resolves. - Makes code more readable than ".then()" chaining. async/await simplifies handling asynchronous operations while still using Promises under the hood. #Day12 #JavaScript #100DaysOfCode

[Article] Ever wondered what actually #TypeScript do. It's not just adding types & stripping them away! It's a sophisticated 5-stage pipeline: 1️⃣ 𝐋𝐞𝐱𝐞𝐫: Turns raw code into meaning full "Tokens" 2️⃣ 𝐏𝐚𝐫𝐬𝐞𝐫: Organizes those tokens into an Abstract Syntax Tree (AST) 3️⃣ 𝐁𝐢𝐧𝐝𝐞𝐫: Creates Symbol Table to manage scopes 4️⃣ 𝐂𝐡𝐞𝐜𝐤𝐞𝐫 (𝐓𝐡𝐞 𝐁𝐫𝐚𝐢𝐧): This is where type validation and inference happens. 5️⃣ 𝐄𝐦𝐢𝐭𝐭𝐞𝐫 (𝐉𝐒): Transform TypeScript code into JavaScript code. Read TS internals:- https://lnkd.in/g7NMPD-9 Grateful to • Hitesh Choudhary • Piyush Garg • Akash Kadlag • Nikhil Rathore • Jay Kadlag • Anirudh Jwala • Suraj Kumar Jha • Chai Aur Code for the guidance. #TypeScript #SoftwareEngineering #WebDevelopment #JavaScript #Compiler #ProgrammingTips #StackAtlas #NodeJs #LearnInPublic #cohort26 #ChaiCode #ChaiAurCode

🚀 Harness the power of JavaScript Promises to handle asynchronous tasks like a pro! 🌟 Promises are objects that represent the eventual completion or failure of an asynchronous operation. Simply put, they help you manage the flow of your code when dealing with time-consuming tasks. For developers, mastering Promises is crucial for writing efficient and scalable code, ensuring smooth execution of operations without blocking the main thread. Let's break it down step by step: 1️⃣ Create a new Promise using the new Promise() constructor. 2️⃣ Within the Promise, define the asynchronous operation you want to perform. 3️⃣ Resolve the Promise with the desired result or Reject it with an error. Here's a code snippet to illustrate: ``` const myPromise = new Promise((resolve, reject) => { // Asynchronous operation let success = true; if (success) { resolve("Operation successful!"); } else { reject("Operation failed!"); } }); myPromise .then((message) => { console.log(message); }) .catch((error) => { console.error(error); }); ``` Pro Tip: Always remember to handle both the resolve and reject outcomes to ensure robust error management. 🛠️ Common Mistake: Forgetting to include the .catch() method to handle errors can lead to uncaught exceptions, so be sure to always implement error handling. ❓ What's your favorite use case for JavaScript Promises? Share in the comments below! 🌐 View my full portfolio and more dev resources at tharindunipun.lk #JavaScript #Promises #AsyncProgramming #WebDevelopment #CodeNewbie #DeveloperTips #LearnToCode #TechCommunity #BuildWithDevSkills

Have you ever wanted to create a dynamic object that can intercept operations? The Proxy and Reflect APIs in JavaScript allow you to do just that! How have you utilized these in your projects? ────────────────────────────── Exploring the Proxy and Reflect API in JavaScript Unlock the potential of Proxy and Reflect in your JavaScript code. #javascript #proxy #reflect #apis ────────────────────────────── Key Rules • Use Proxy to create a wrapper around an object to redefine fundamental operations. • Reflect provides methods that mirror the behavior of the Proxy handlers, making your code cleaner. • Always consider performance implications when using proxies, as they can add overhead. 💡 Try This const target = {}; const handler = { get: (obj, prop) => prop in obj ? obj[prop] : 'not found' }; const proxy = new Proxy(target, handler); console.log(proxy.someProperty); ❓ Quick Quiz Q: What does a Proxy do in JavaScript? A: It intercepts and customizes operations on an object. 🔑 Key Takeaway Embrace the power of Proxy and Reflect to create more flexible and maintainable code! ────────────────────────────── Small JavaScript bugs keep escaping to production and breaking critical user flows. Debugging inconsistent runtime behavior steals time from feature delivery.

🚀 Day 952 of #1000DaysOfCode ✨ Understanding Arrow Functions in JavaScript Arrow functions look simple — but there’s more to them than just shorter syntax. In today’s post, I’ve explained arrow functions in a clear and practical way, including how they differ from regular functions and where they should (and shouldn’t) be used. From lexical `this` binding to cleaner function expressions, arrow functions help you write more concise and predictable code when used correctly. But they also come with limitations — especially when working with methods, constructors, or certain event handlers. Understanding these trade-offs is what helps you use them effectively in real-world applications. If you’re writing modern JavaScript, mastering arrow functions is a must-have skill. 👇 What’s one mistake you made while learning arrow functions? #Day952 #learningoftheday #1000daysofcodingchallenge #FrontendDevelopment #WebDevelopment #JavaScript #React #CodingCommunity #JSBasics

🚀 Chai aur TypeScript – Day 6 Today I learned about Type Narrowing and Type Guards. 🔑 Key Learnings: • unknown → safer than any (requires type checking) • typeof → used to narrow primitive types • instanceof → used for class-based checks • Truthy checks → ensure value exists before using • Custom type guards → validate object structure • switch / conditions → handle all possible cases 💡 Big Insight: Always narrow the type before using the data to ensure safety #ChaiAurTypescript #TypeScript #JavaScript #LearningInPublic #DeveloperJourney #ChaiCode