Why this code isn't working?

Question

var years = (1990, 1457, 1976);

function arrayCalc(arr, fn) {
var arrRes = [];
for (var i = 0; i < arr.length; i++) {
arrRes.push(fn(arr[i]))
}
return arrRes;
};

function calculateAge (el) {
return 2018 - el;
}

var ages = arrayCalc(years, calculateAge);
console.log(ages)

Answer 1

I don't need to call that function first

Answer 2

Just sent a reply on your new question Anshif :)

Answer 3

You have to change your years variable to an array or work out a way to convert it to an array in your script. It can not be iterated over using indexing in its current state.

Answer 4

Allan can you answer to my another question