It makes the code icky and hard to debug, and you can simply return new immutable objects for every state change.
EDIT: why not just create a new object and reassign variable to point to the new object
It makes the code icky and hard to debug, and you can simply return new immutable objects for every state change.
EDIT: why not just create a new object and reassign variable to point to the new object
Well, but then you’re basically just pushing the mutability onto the container, since you need to be able to replace elements within it.
It’s a good strategy at times though. Like say you’re working in a language where strings are immutable and you want a string you can change. You can wrap it in a list along the lines
s=['foo']and pass references to the list around instead. Then if you gos[0]='bar'at some point, all the references will now see['bar']instead.