Code language: JavaScript
(function () {
// Safely declare your names inside this function.
var variable1 = 1;
let variable2 = 2;
const constant = 3;
function someFunction() {}
class SomeClass {}
})();
At the heart of this pattern, there is an anonymous function
function () {…}. This is a function expression that simply creates a function and returns it as a value, in contrast to a function declaration that creates a function and inevitably binds it to a name.The braces around the anonymous function,
( function() {…} ), allow the parser to recognize the function expression correctly. Finally, the braces at the end()call the function immediately. That is why it is called immediately-invoked function expression.
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