[Codewars] Array plus array (8 kyu) / JavaScript

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DESCRIPTION:

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.

 

코드

function arrayPlusArray(arr1, arr2) {
  return arr1.concat(arr2).reduce((a, b) => a + b, 0);
}