function fib(num) {
var arr = [];
if (num == 1) {
return arr = [1];
} else if (num == 2) {
return arr = [1, 1];
} else {
arr = [1, 1];
for (var i = 2; i < num; i++) {
arr[i] = arr[i-1] + arr[i-2];
}
return arr;
}
}
console.log( fib(8));