JavaScript
The concepts interviews actually ask about.
JavaScript, stripped to what interviews actually ask about. Every page takes about five minutes: one situation, one visual, runnable code, and the questions you'll hear across the table.
Start here
- Why JavaScript was made and where it runs.
- How JavaScript works.
- Pros and cons, and when not to use it.
Language basics
Short pages on variables, types, functions, closures, this, objects,
arrays and modern syntax — the half of every interview.
How it runs and async
Call stack, the event loop flagship, memory, callbacks, promises and
async/await — the other half.
Browser and interview prep
DOM events, fetch and storage, performance patterns — then the question bank with every question searchable, twelve output puzzles, ten coding challenges, and a one-page cheat sheet.
How to use this topic
Read a page in five minutes: situation first, visual second, then run the code and change it. Guess every puzzle before revealing. Finish with the bank filtered to your weak topics.