Task

Show how to concatenate two arrays in your language.



If this is as simple as array1 + array2, so be it.




 
a1: [1 2 3]
a2: [4 5 6]
a3: [7 8 9]
 
append a1 a2 ; -> [1 2 3 4 5 6]
 
append/only a1 a3 ; -> [1 2 3 4 5 6 [7 8 9]]
 