Immediately-invoked function expression
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An immediately-invoked function expression (or IIFE, pronounced "iffy") is a JavaScript design pattern which produces a lexical scope using JavaScript's function scoping.
Description
Immediately-invoked function expressions can be used to:
- Avoid variable hoisting from within blocks
- Protect against polluting the global environment
- Simultaneously allow public access to methods while retaining privacy for variables defined within the function
This pattern has been referred to as a self-executing anonymous function; Ben Alman introduced "IIFE" as a more semantically accurate term for the pattern, shortly after its discussion arose on comp.lang.javascript.
Code sample
(function(app) {
})(window.app || (window.app = {}));
