JAVASCRIPT plz

Write a function that takes an array of numbers, and returns an array with the same number of elements, with each element's value being the running total from the original array.

example: runningTotal([2, 5, 13]); // [2, 7, 20]

runningTotal([14, 11, 7, 15, 20]); // [14, 25, 32, 47, 67]

runningTotal([3]); // [3]

runningTotal([]); // []