The Gap That LeetCode’s 30 Days of JavaScript Actually Fills | by Bogdan Andrei | Medium
Most coding challenges teach you to solve puzzles. LeetCode’s 30 Days of JavaScript study plan does something different: it shows you how puzzle pieces can transform into bricks, ready to build real-world projects. This distinction matters. When you solve a typical algorithmic problem, you’re training your mind to think abstractly. But when you implement a debounced function or build an event emitter, you’re learning how real software works. I discovered this while working through the challenges myself. The experience was less like solving brain teasers and more like archaeology — uncovering specific, modern JavaScript concepts. Each section focused on another piece of JS’s modern features. The peculiar thing about this study plan is that it won’t teach you JavaScript. In fact, I believe you need to already know JavaScript reasonably well to benefit from it. What it teaches instead is how JavaScript is actually used to solve real engineering problems. Consider the Memoize challenge. On