JavaScript IIFE Explained

Explanation of JavaScript Immediately Invoked Function Expression

IIFE stands for Immediately Invoked Function Expression. It's a JavaScript design pattern that allows you to create a function that is executed immediately after it is defined. IIFE is a powerful way to encapsulate code and avoid global namespace pollution.

(function() {
  // code to be executed immediately

In this example, we define an anonymous function and immediately invoke it. The function is wrapped in parentheses to make it an expression, and then we append () to immediately invoke it.

You can also pass arguments to an IIFE:

(function(param1, param2) {
  // code to be executed immediately
})(value1, value2);

Here we defined an IIFE with two parameters, param1 and param2. We then immediately invoke it and pass in value1 and value2 as arguments.

IIFE is commonly used to create private variables and methods. By encapsulating code within an IIFE, you can avoid conflicts with other libraries and code that might be running on the same page.