Why we use Immediately Invoking functions in javascript ? to avoid polluting the global namespace. Whatever we declare in IIFE, those things won't be available in global scope. You can do the same in a simple block in ES6, the keywords like let, const won't pollute global scope. See below examples
Using ES5
Observe below code
(function () { // open IIFE var tmp = ···; ··· }()); // close IIFE console.log(tmp); // ReferenceError
Using ES6
Observe below code, Using simple block with let, const keywords are enough
{ // open block
let tmp = ···;
···
} // close block
console.log(tmp); // ReferenceError
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