IIFE

iife.js

var arr = [];
for (var i = 1; i <4 ; i++) {
    arr.push(function(j) {
        return function() {console.log(j);}
    }(i));
 }
arr[0]();
arr[1]();
arr[2]();

// ====================
  

var arr = [];
for (var i = 1; i <4 ; i++) {
    arr.push(function(j) {
        console.log(j);
    }(i));
 }
arr[0];
arr[1];
arr[2];