Concatenates the two arrays by returning an array with the values from the first and the second array.
Note that it is also possible to use a single value of the same type as the array instead of a second array.

array_1 + array_2

Array with the values from the first and second array.

This causes z to be the array [1,2,3,4,5,6]:

numberVar array x := Array(1,2,3);
numberVar array y := Array(4,5,6);
numberVar array z := x + y;

This causes z to be the array [1,2,3,0]:

numberVar array x := Array(1,2,3);
numberVar y := 0;
numberVar array z := x + y