Array Flatten in JavaScript: Every Approach Explained
From nested chaos to clean lists — understand, implement, and ace every flatten question.
Latest posts
Page 4 of 7
Spread vs Rest Operators in JavaScript: Expanding vs Collecting
A flow diagram showing a source array [1, 2, 3] being unpacked by the ... spread syntax into three individual amber-coloured elements, which then merg
Setting up Express.js with TypeScript
TypeScript catches Express bugs at compile time, not in production. This guide sets up strict typing, hot-reload dev workflow, and a compiled producti
Error Handling in JavaScript: Try, Catch, Finally
Learn how structured error handling in JavaScript turns crashes into recoverable moments with real code, clear patterns, and zero fluff.
The new Keyword in JavaScript: What Actually Happens
A Deep Dive into Object Creation & Prototype Linking
Template Literals in JavaScript: Write Strings Like a Human
Template literals replace messy string concatenation with readable, expressive syntax. They support embedded expressions, multi-line strings, and tagged…
String Polyfills and Common Interview Methods in JavaScript
"I thought I knew strings. Then an interview asked me to implement .includes() from scratch — and I froze." Here's the thing: JavaScript is everywhere. But…
Callbacks in JavaScript: Why They Exist
Written by Saurabh Prajapati Software Engineer @ IBM India Software Lab I remember the first time I saw this in someone's code: I stared at it and thought…
JavaScript Modules: Import and Export Explained
By Saurabh Prajapati · Full-Stack Engineer at IBM India Software Lab · WebDev Cohort 2026 Before we even talk about modules, let me paint a picture of what…
Why Does setImmediate Sometimes Run Before setTimeout(fn, 0)?
Author: Saurabh Prajapati · Software Engineer @ IBM India · May 2025 I was writing some async Node.js code and stumbled across something that genuinely…
The Magic of this, call(), apply(), and bind() in JavaScript
The Magic of this, call(), apply(), and bind() in JavaScript
Function Declaration vs Function Expression: What's the Difference?
By Saurabh Prajapati | IBM Software Engineer | WebDev Cohort 2026 When I first started writing JavaScript, I would just write functions like this and move…