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Ya know the more I reflect on the languages I know the more I realize that outside of functional languages none of them really handle immutability well.
Consider that you want most of your objects to be immutable most of the time. Thats all well and good till you realize you want to be able to edit the objects in such a way that it creates duplicates that have some data changed but are likewise immutable.
This tends to stop working, almost entierly, once you get into subclassing. If you parent class has a method that returns a copy of itself with some data modified, this will break in children classes, since you want children classes to return instances of itself, not its parent.
Its not that you cant fix that, but the code gets very ugly very quickly. Generally you are forced to let the code handling the classes do the copying and editing itself, but that is pretty ugly too.
I have had this pattern problem in almost every OO language i messed with, Java, Ruby, Python, etc.
@freemo True. Today I tried to implement some immutable status. Once I want to update the value, or I want to use it as a counter, then I must use some new variable and then reassemble the status object.
Mutable status is fine but then I need something like volatile or lock to ensure multithread safety...
