How to add an array

Question

If the user inputs an array, starting by the length of it:
I.e.

Input: 3, 4, 5, 6
[4,5,6]

How can I code in order to get the sum of the contents of the array?

I.e

Input : 4,5,5,6,0

Output: 16

Answer 1

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

Answer 2

sum = array.reduce((r,v) => r+v,0);

assuming the array contains numbers, not strings ^^