Immutability

The practice of creating new values instead of changing existing ones.

What is Immutability in JavaScript?

Immutability — The practice of creating new values instead of changing existing ones.

const order = { item: "tea", quantity: 1 };
const updatedOrder = { ...order, quantity: 2 };

Level: Freelancer · More JavaScript terms at this level

Updated September 27, 2026