Debugging JavaScript: A Practical Approach

JavaScript is single threaded, but handles async operations so smoothly 👇 That’s where the Event Loop comes in. At first, things seem simple: • Code runs line by line But then you see behavior like this: Even with 0ms, the timeout doesn’t run immediately. Because JavaScript uses: ✔ Call Stack ✔ Web APIs ✔ Callback Queue ✔ Event Loop Understanding this changed how I think about async code and debugging. Sometimes the delay isn’t about time, it’s about how the event loop schedules execution. #JavaScript #EventLoop #AsyncJavaScript #FrontendDevelopment #Programming

Closures in JavaScript felt confusing, until they didn’t 👇 At first, it’s hard to understand how a function can “remember” variables even after execution. But that’s exactly what closures do. A closure is created when a function retains access to its lexical scope, even after the outer function has finished executing. Even though `outer()` has finished execution, the inner function still has access to `count`. That’s the power of closures. They are widely used for: • Data encapsulation • Maintaining state • Creating reusable functions Understanding closures makes many JavaScript patterns much clearer. #JavaScript #Closures #FrontendDevelopment #SoftwareEngineering #Programming

When I started JavaScript… I thought: 👉 “Browser is running my code” Reality 👇 There’s an ENGINE behind everything ⚡ 👉 The V8 Engine That’s when I realized: 💡 Code ≠ Execution 💡 Syntax ≠ Performance 🔥 The real game: Understanding what happens under the hood Since then… I don’t just write JS 👉 I write V8-friendly JS 💬 When did YOU realize this? 👇 #JavaScript #Learning #Developers #V8 #CodingJourney

Understanding JavaScript Execution Context changed how I debug code 👇 At first, JavaScript feels straightforward. But when things don’t behave as expected, execution context is usually where the answer lies. Every time a function runs, JavaScript creates a new execution context. Inside it: • Variables are created • Functions are stored • `this` is determined And all of this happens before the code actually executes. That’s why things like hoisting and scope behave the way they do. This behaves differently than many expect. Once I understood this, debugging became much clearer. Sometimes the problem isn’t the code, it’s understanding how JavaScript runs it. #JavaScript #ExecutionContext #FrontendDevelopment #SoftwareEngineering #Programming #LearningInPublic

JavaScript Array Trick (Most Devs Miss This!) Problem: let arr = [1, 2, 3, 4, 5]; arr[10] = 42; console.log(arr); console.log(arr.length); What will be the output? #javascript #mern #webdevelopment #coding #developer

Day 5 of 100 days. A situation many developers encounter when working with JavaScript, especially at the early stages… You write your code, trigger an action, and expect a response - but nothing happens. No error. No output. Just silence. And it’s not just beginners - this is a common experience across all levels. The challenge: JavaScript not responding 👉 What I always advise: • Ensure your script is properly linked • Confirm the DOM has fully loaded before running your code • Use console.log() to trace and debug your logic Often, the issue isn’t complex - it’s simply hidden. Do you use console.log() when debugging, or do you have another favorite method? Share your approach in the comments! #FrontendDevelopment #100DaysOfSolvingCodingProblems #WebDevelopment #CodingTips #Debugging #JavaScript

Built an efficient JavaScript solution to find the maximum and second maximum elements in an array using a single pass approach, optimizing performance with O(n) time complexity and constant space. #JavaScript #DSA #Coding #LeetCode #WebDevelopment

Demystifying the JavaScript Event Loop: Call Stack, Task Queue, and Asynchronous Execution Learn how JavaScript’s single‑threaded engine handles asynchronous code using the call stack and task queues. This tutorial breaks down the event loop, visualizes execution order, and shows best‑practice patterns for reliable, non‑blocking code. Read the full article 👇 https://lnkd.in/g-8QSE-c #JavaScript #WebDevelopment #Programming #Tech #SoftwareEngineering #EventLoop #AsyncProgramming #CallStack #TaskQueue #NonBlockingCode #FutureOfWork #DigitalTransformation

Do You Really Understand the JavaScript Event Loop? 🤔 Most developers use async code daily… but few truly understand what happens behind the scenes.

Day 10/100 of my #100DaysOfCode journey. Today I started learning one of the most important concepts in modern JavaScript — Promises. Key concepts I explored: • synchronous vs asynchronous code • how Promises work (pending → fulfilled → rejected) • handling async operations using .then() and .catch() To practice, I created a small example that simulates an API call using a Promise and setTimeout. One interesting realization: Automation frameworks interact with browsers and APIs constantly — both of which are asynchronous operations. Understanding Promises is essential before moving to async/await, which is heavily used in tools like Playwright. Next → rewriting these examples using async/await. #100DaysOfCode #SoftwareTesting #JavaScript #QAAutomation #LearningInPublic