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What are IIFE or Immediate Functions on JavaScript?

obetomuniz profile image Beto Muniz ・1 min read

😁 IIFE or Immediately-invoked Functions Expressions is a design pattern that runs functions as soon as such functions are created on its runtime environment.

😎 In general, IIFE's are related to the desire to not pollute the global object and/or to isolate business logics.

;(function thisIsANamedIIFE() { 
    let name = "Beto Muniz";
})();
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πŸ˜‹ This pattern is used a lot for library creators. Even Rollup.js, which is a good bundler for libraries offer this output.

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