Web Reference: What Is an IIFE? Normally, a function runs only when it is called. An IIFE runs automatically when the JavaScript engine reads it (compiles it). Jul 11, 2025 · Immediately Invoked Function Expressions (IIFE) are JavaScript functions that are executed immediately after they are defined. They are typically used to create a local scope for variables to prevent them from polluting the global scope. Feb 5, 2026 · This strange-looking syntax is called an Immediately Invoked Function Expression, or IIFE (pronounced “iffy”). And once you understand it, you’ll start seeing it everywhere in JavaScript codebases.
YouTube Excerpt: This video is a tutorial which describes Immediately Invoked Function Expressions in
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