Prototypes and Prototype Chain

Prototypes and Prototype Chain — a practical guide to JavaScript prototypes with clear examples you can reuse in real projects.

JavaScript Tutorial Series (60/101). Prefer one article? Read the complete JavaScript tutorial.

Short description

When a property is missing, JS walks the prototype chain.

Prototype tip

const proto = { greet() { return 'hi'; } };
const obj = Object.create(proto);
obj.greet();