Destructuring

Short explanation

Destructuring extracts values from arrays or objects into variables, making code concise and expressive.

Syntax example

const [a, b] = [1, 2];
const { name, age } = { name: 'Sam', age: 25 };

How JS handles it internally

The parser recognizes destructuring patterns and emits assignments that extract values, with support for defaults and nested patterns.

FAQ

Q: Is destructuring slower?

A: Slight overhead exists but readability and maintainability usually win; avoid over-destructuring in performance-critical loops.