Right. But OOP makes it central, and builds around it, while FP de-emphasizes it in preference to ADTs.
Strings are a good illustration. Instead of an abstract polymorphic String type, Haskell provided a concrete String type as an ADT. This proved too inflexible, which is why we have Text, lazy Text, ShortText, etc. Compare to NSString which also has multiple representations but hides them behind a single polymorphic interface.
Strings are a good illustration. Instead of an abstract polymorphic String type, Haskell provided a concrete String type as an ADT. This proved too inflexible, which is why we have Text, lazy Text, ShortText, etc. Compare to NSString which also has multiple representations but hides them behind a single polymorphic interface.