Primitive and Non-Primitive Data Types

Primitive and Non-Primitive Data Types — a practical guide to JavaScript primitive vs object with clear examples you can reuse in real projects.

JavaScript Tutorial Series (13/101). Prefer one article? Read the complete JavaScript tutorial.

Short description

Mutating a shared object affects all references — a common source of bugs.

Reference tip

const a = { n: 1 };
const b = a;
b.n = 2;
console.log(a.n); // 2