Iterating type variables
One of the most common use cases for type introspection is that of iterating over a type's instance variables. The simplest example of this would be adding a #to_h method to an object that returns Hash using the type's instance variables for the key/values. This would look like this:
class Foo
getter id : Int32 = 1
getter name : String = "Jim"
getter? active : Bool = true
def to_h
{
"id" => @id,
"name" => @name,
"active" => @active,
}
end
end
pp Foo.new.to_h
Which, when executed, would print the following:
{"id" => 1, "name" => "Jim", "active" => true}
However, this is less than ideal because...