sum of 1d array running

var calculateRunningSum = function(nums) {
var n = nums.length;
var runningSum = new Array(n);
let sum = 0;

for (var i = 0; i < nums.length; i++) {
sum = sum + nums[i];
runningSum[i] = sum;
}

return runningSum;
};

var nums = [1, 2, 3, 4, 5,6];
var result = calculateRunningSum(nums);
console.log(result);