Protopie seems limited since a message can be sent using only one value as a parameter. However, arrays (written as text strings and manipulated by parseJson) can be used for contexts where multiple parameters need to be passed.

Receiving a message, and then assigning a value and then writing a conditional based on that value is that something that is quite a normal, conceptual pattern – but in Protopie it will often not work as expected. This is because responses to Protopie triggers all happen simultaneously and not in the order written.