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Your IIFE is returning another function, which is not being called. If you want to print 1,2,3, do this:

var arr = [];

    for (var i = 0; i < 3; i++) {
        arr.push(
            (function(j) {
                return function() {
                    console.log(j);   
                }
            }(i)())
        )

    }

You're getting 3 because the method push adds the element to the end of the array and returns the new length for the array. Some reference: developer.mozilla.org/en-US/docs/Web/JavaScript/R…

If your IIFE doesn't return another function, then you don't need the double parenthesis at the end.