Using the forEach function defined for an array, find the sum of the array of numbers. [function add_all(arr) {...}] code example

Example 1: sum javascript

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

Example 2: sum all elements in array javascript

arr.reduce((a, b) => a + b)