Section
JavaScript
The language the web runs on — fundamentals, modern features, and the parts you actually reach for day to day.
Latest in JavaScript
Two Sum
Given an array of integers and a target, return the indices of the two numbers that add up to it. A classic warm-up for hash maps.
kvi5hnuThe five array methods you will actually reach for
map, filter, reduce, find and some/every cover almost every array transform you will ever write. Here is when to pick each and the one-line patterns worth memorising.
kvi5hnu2 minPromises and async/await, the short version
A clear, no-magic walkthrough of how promises run on the event loop, where microtasks fit in, and why async/await is just a shorter spelling of the same mechanics.
kvi5hnu2 min