Array-plus-array.js

/*
  I'm new to coding and now I want to get the sum of two arrays... Actually the sum of all their elements. I'll appreciate for your help.

  P.S. Each array includes only integer numbers. Output is a number too.
*/

// Answer:

function arrayPlusArray(arr1, arr2) {
  return arr1.reduce((acc,curr) => acc + curr) + arr2.reduce((acc,curr) => acc + curr);
}

// BigO: O(n)