JavaScript Fundamentals

Values and references, the four equality algorithms, scope and closures, this and arrow functions, prototypes and classes, the event loop, and modules.

Read

46 min

Practice MCQs

25

Interview QA

25

Edition

v2

Editorial status

Reviewed

Relevant for

Frontend Engineer

Scope: ECMAScript 2024 and later, with Node behaviour cited from the active Node.js LTS line and browser behaviour from the WHATWG HTML event loop.