Blog

Breadth-first and depth-first search are the same algorithm with one data structure swapped. See both walk the same graph, and learn which to reach for.

Recursion feels like magic until you see the call stack. Here's the mechanical picture — frames pushing and popping — plus base cases, stack overflows, and tail calls.

Two of the highest-leverage array patterns in interviews and real code — how they turn nested O(n²) loops into a single O(n) pass, and when each one applies.

The prototype chain is the engine behind every JavaScript object and the class keyword is sugar on top of it — here's how the whole thing actually works.

Why this is confusing in JavaScript and how four simple binding rules — plus arrow functions — determine its value in any situation.

Why [] == ![] is true and other coercion puzzles — the actual rules behind == , truthiness, and the handful of habits that keep them from biting.

How binary search eliminates half the problem with every comparison, and how binary search trees turn the same idea into a data structure — with interactive animations.

What a closure actually is, how the scope chain makes it work, and the three places closures matter most — private state, the classic loop bug, and React hooks.

An interactive guide to debouncing and throttling — when to use each, how to implement them from scratch, and the edge cases that bite in production.

How hash maps actually work — hashing, buckets, collisions, and resizing — with an animated walkthrough and a from-scratch implementation.