Create a function, matrix_add(), that does the following:
- array1: a multi-dimensional array
- array2: a multi-dimensional array
- output: a multi-dimensional array
var array1 = [ [1,2,3], [3,4,5], [6,7,8] ] var array2 = [ [1,2,3], [1,2,3], [1,2,3] ]
output = matrix_add(array1,array2); console.log(output); //outputs [ [2,4,6], [4,6,8], [7,9,11] ]