Ilk
From Director Online Wiki
ilk() is a Lingo function that determines the type of a variable.
Syntax:
ilk(variable)orvariable.ilk
returns the [[[type]] of the variable as a symbol. See the type entry for a full list of variable types.
ilk(variable, type)
returns true or false depending on whether the variable is of the type indicated.
Examples:
testList = [1,2,3,4]
put testList.ilk
-- #list