1console.log(
2  [1, 2, 3, 4].reduce((a, b) => a + b, 0)
3)
4console.log(
5  [].reduce((a, b) => a + b, 0)
6)

1values.reduce(function(a, b){return a+b;})
2

1function addSum(array) { // call the function with your array parameter
2   let solution = 0     
3   for (let x = 0 ; x < array.length;x++) { // for loop
4      solution = solution + array[x]
5   }
6   return solution
7}