Interview Question

What is scope in JavaScript?

Scope controls where bindings are visible.

💡 Concept ✅ Quick Revision ⚡ JavaScript

Answer

Scope determines where a binding can be resolved by name. • ECMAScript uses lexical environments to record bindings and outer-environment links. • Functions, modules, scripts, and blocks can establish scopes. • Identifier lookup follows the chain of outer lexical environments.

Example

Code

const outer = 'outside';
{
  const inner = 'inside';
  console.log(outer, inner);
}

Output

outside inside

Quick Revision

Scope controls where bindings are visible.

←

PreviousWhat is hoisting?

NextDifference between global and local scope?

→