Answer
IIFEs run immediately after creation. They isolate scope and avoid global pollution.
Quick Answer
An IIFE is a function that defines and calls itself immediately: (function() { ... })(). It creates a private scope — variables inside don't pollute the global scope. Before ES6 modules, IIFEs were the standard way to encapsulate code. Now replaced by ES modules and block scoping with let/const, but still useful for immediate initialization.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ