Sum of two Arrays

Given two arrays, join the arrays and return the summation of every elements from both arrays.

Sample Code:

function sumSum(arr1,arr2) {
// Enter your logic here...
}

Examples:

Input: [1,2,3],[1,2,3]
Output: 12
Explanation: 12 is the result of summing up all the numbers in both arrays.

Input: [-1,-2,-3],[1,-2,-3]
Output: -10
Explanation: -10 is the result of summing up all the numbers in both arrays.