function concatenator$($a$,$b$)\{$

$//$ concatenator takes two arguments named a and b:

$//*$ If a and b are strings, return them concatenated

$//*$ If a and b are numbers, return their sum

$//$ Other conditions that must be met:

$//*$ Both a and b must be of the same type. If they are not the same type, return the string "a and b must be of the same type"

$//*$ a and b can be either numbers or strings. If they are not, return "a and b must be numbers or strings"

$//$ Hint: The order of the conditions in the pseudo$-$code above and in the actual code is not necessarily the same

$//$ Hint: It's advised to deal with the other conditions first, like arguments being of the wrong type.

$//$