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JavaScript

Module

Definition

A self-contained unit of code that exports specific values (functions, objects, classes) and imports what it needs from other modules. ES modules use `import`/`export` syntax.

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Related Terms

Scope

The region of code where a variable is accessible. JavaScript has global scope, function scope, and block scope. Block scope was introduced with let and const in ES6.

IIFE

Immediately Invoked Function Expression — a function that runs immediately after being defined. IIFEs create a private scope and are used to avoid polluting the global namespace.