[FAQ] Is it possible to check that an object can be cast to the type (something like "test" is B)? #433
Description
General Question
I want to check that an obkect can be cast to the type.
Currently I found only one method: get type name with typeof and compare with target type name and all of childs target type names.
For example:
schema A:
name: str
schema B(A):
foo: str
schema B1(B):
foo = "1"
schema B2(B):
foo = "2"
is_B = lambda o: A {
# Is it possible make this expression without compare with all child type names?
typeof(o) == "B" or typeof(o) == "B1" or typeof(o) == "B2"
}
a = A {name = "a"}
b = B {name = "b", foo = "3"}
b1 = B1 {name = "b1"}
b2 = B2 {name = "b2"}
check_a = is_B(a)
check_b = is_B(b)
check_b1 = is_B(b1)
check_b2 = is_B(b2)