Hoisting in JavaScript

Hoisting in JavaScript — a practical guide to JavaScript hoisting with clear examples you can reuse in real projects.

JavaScript Tutorial Series (49/101). Prefer one article? Read the complete JavaScript tutorial.

Short description

let/const are hoisted but uninitialized until the line runs (TDZ).

Hoisting tip

function declarations hoist fully
var hoists as undefined
let/const TDZ until init
Prefer declare before use