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JavaScript Tutorial

Variables to closures, promises, the DOM and OOP — a complete JS reference.

Arrow Functions

A concise function syntax introduced in ES6 that does NOT have its own this, arguments, or prototype.

const add = (a, b) => a + b;
const square = x => x * x;
const greet = () => console.log('hi');

Shorter syntax, implicit return for single expressions
No own this — inherits it from the enclosing scope (great for callbacks)
Cannot be used as a constructor (no new)
No arguments object — use rest parameters instead

Tip

Give one concrete reason to avoid arrow functions: object methods that need their own this.