var findMaxAverage = function (nums, k) {
var max = 0;
while (nums.length >= k) {
a = nums.slice(0, k);
n = sum(nums.slice(0, k));
console.log(n);
if (n > max) {
max = n;
}
nums.shift();
}
return max / k;
};
function sum(arr) {
var s = 0;
arr.forEach(function (val, idx, arr) {
s += val;
}, 0);
return s;
}
console.log(findMaxAverage([1, 12, -5, -6, 50, 3], 4));