Easy. Running Sum of 1d Array

var runningSum = function (nums) {
  let sum = 0;
  let result = new Array();
  for (let i = 0; i < nums.length; i++) {
    sum += nums[i];
    result.push(sum);
  }
  return result;
};

Input: nums = [1,2,3,4]

Output: [1,3,6,10]

Explanation: Running sum is obtained as follows: [1, 1+2, 1+2+3, 1+2+3+4]

 

Input: nums = [1,1,1,1,1]

Output: [1,2,3,4,5]

Explanation: Running sum is obtained as follows: [1, 1+1, 1+1+1, 1+1+1+1, 1+1+1+1+1]

 

반복문을 사용해 num 값들을 sum에 차례대로 더해준다.

더해줄 때마다 sum을 result 배열에 담아준다.