JavaScript
Mastering TypeScript: Interfaces, Generics, and Union Types Explained
TypeScript from the ground up: type annotations, interfaces, type aliases, union and intersection types, generics and tsconfig.
JavaScript
The language itself, from variables, operators and functions to objects, this, Promises and async/await. Several posts build the same idea in small steps, and the later ones cover TypeScript and the questions that come up in JavaScript interviews.
23 articles
Learning paths in JavaScript
JavaScript Fundamentals
Start here if you are new to JavaScript. Each post builds on the one before it, from variables to how `this` and `new` work.
9 partsAsync JavaScriptHow JavaScript handles work that takes time: the synchronous model first, then callbacks, Promises, async/await and error handling.
5 partsAll JavaScript articles
JavaScript
JavaScript Map and Set: The Data Structures You Should Be Using Instead of Objects and Arrays
Learn when to use JavaScript Map and Set instead of Object and Array. Includes performance benchmarks, real code examples, and clear trade-offs.
JavaScript
JavaScript Destructuring: Write Less Code, Extract More Value
Learn JavaScript destructuring with real before/after examples. Covers array destructuring, object destructuring, default values, and function parameters.
JavaScript
Understanding the `this` Keyword in JavaScript: What It Is and How Calling Context Controls It
Learn how the `this` keyword works in JavaScript — global scope, object methods, callbacks, and arrow functions — with clear runnable examples.
JavaScript
Synchronous vs Asynchronous JavaScript: How the Language Actually Executes Code
How JavaScript runs one thing at a time, and how asynchronous code hands off slow work like API calls and timers without freezing the page.
JavaScript
Async/Await in JavaScript: Writing Cleaner Asynchronous Code
Async/await is syntax over Promises that makes async code read top to bottom. How it works, error handling with try/catch, and parallel calls with Promise.all.
JavaScript
Array Flatten in JavaScript: Every Approach Explained
From nested chaos to clean lists — understand, implement, and ace every flatten question.
JavaScript
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
JavaScript
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.
JavaScript
The new Keyword in JavaScript: What Actually Happens
What JavaScript does step by step when you call a function with new: object creation, prototype linking, binding this, and what goes wrong without new.
JavaScript
Template Literals in JavaScript: Write Strings Like a Human
Template literals in JavaScript: embedded expressions, multi-line strings and tagged templates, and how they replace string concatenation.
JavaScript
String Polyfills and Common Interview Methods in JavaScript
Implement String methods like includes, trim and repeat from scratch: how string polyfills work and the string questions that come up in interviews.
JavaScript
Callbacks in JavaScript: Why They Exist
Why callbacks exist in JavaScript, how they work with async code like timers and file reads, and where nesting them starts to hurt.
JavaScript
JavaScript Modules: Import and Export Explained
How JavaScript modules work: named and default exports, imports, and how splitting code into modules keeps a project maintainable.
JavaScript
The Magic of this, call(), apply(), and bind() in JavaScript
How this works in JavaScript functions and objects, and how call(), apply() and bind() let you control it, with a side-by-side comparison and exercises.
JavaScript
Function Declaration vs Function Expression: What's the Difference?
Function declarations vs function expressions in JavaScript: syntax, hoisting, when to use each, and a quick look at arrow functions.
JavaScript
JavaScript Operators: The Basics You Need to Know
JavaScript operators explained: arithmetic, comparison, logical and assignment operators, with == vs === and a short practice exercise.
JavaScript
Understanding Objects in JavaScript — A Developer's Exploration
JavaScript objects from the ground up: key-value pairs, creating objects, reading, updating and deleting properties, and looping through keys.
JavaScript
Control Flow in JavaScript: If, Else, and Switch Explained
How JavaScript decides which code runs: if, else if, else and switch statements, with examples and when to use each.
JavaScript
Understanding Variables and Data Types in JavaScript
Real-life box analogy to introduce variables intuitively All 3 declaration types (var, let, const) with clear examples and when to use each Comparison
JavaScript
Arrow Functions in JavaScript: A Simpler Way to Write Functions
An arrow function is just a shorter, more modern way to write a function in JavaScript. That's honestly all it is. It was introduced in ES6 (2015) and
JavaScript
The Chai Stall Promise System: How Hitesh Bhaiya Manages Orders
JavaScript Promises aren't complicated once you stop thinking of them abstractly.
JavaScript
Top 10 JavaScript Array Methods You Probably Haven't Used Yet
Ten JavaScript array methods beyond the basics, including copyWithin, reduceRight, with and flatMap, plus a Shinchan-story warm-up on push, pop, slice, map and find.