Set-builder based times

gistfile1.js

function times(n, fn) {
    var arr = [];
    for (var i = 0; i < n; i++) {
        var res = fn(i);
        if (typeof res != 'undefined') {
            arr.push(res);
        }
    }
    return arr;        
};


//Execute the given function N times
times(5, function (i) {
    console.log(i);
});

//Initialize an array
var arr = times(10, function (i) {
    return i;
});
console.log(arr); //[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 

//Initialize an array only with even numbers
var arr1 = times(10, function (i) {
    if (i % 2 == 0) return i;
});  
console.log(arr1); //[0, 2, 4, 6, 8]