Arrow Functions

Arrow functions provide concise syntax and lexically bind this from the surrounding scope — no bind(this) needed.

Example

const add = (a, b) => a + b;
const double = n => n * 2;
const obj = () => ({ key: "value" }); // wrap in () to return object
const nums = [1, 2, 3].map(n => n * 2); // [2, 4, 6]
// Arrow keeps outer "this"
this.timer = setInterval(() => this.tick(), 1000);

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Pro Tip

Do not use arrow functions as object methods — they inherit outer this, not the object.

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