Expressions are strictly typed
Kissflow is strictly typed. That means that fields will not accept a data type that it is not meant to receive.
Accepted Data Type
Multi select user
That also means that functions will not accept parameters that do not adhere to its functional signature.
Expressions are chained
Chaining is a way of writing expressions that are considered to be more readable and easily writable. Most functions that manipulate a data type is implemented as a chainable method of that data type.
Instead of (functional):
Here is a tip to read or write chained functions think left to right on the progressive manipulations you need to do. If this were functional you would do it inside to outside.
Here are more articles about expressions: