Task: swapping values

Destructuring lets you swap values without a separate helper variable.

let a = 10;
let b = 20;
[a, b] = [b, a];
console.log(a, b); // 20, 10

To be precise: the right-hand side is evaluated before the assignment on the left. The variables must allow reassignment.

Pitfall: solutions using addition or XOR are limited by types and number ranges. Destructuring is more readable and works for other values too.