Using hashes instead of classes.
Classes as a documentation tool—specifically, as a way of making functions easy to find.
Preferring module inclusion to subclassing (which is akin to preferring adjectives to nouns as a way of organizing the documentation of verbs). (Vaguely similar to duck-typing in Haskell.)
Object dot notation as a more readable way of writing function composition. (Similar to the motivation for the
->macro in Clojure or type-directed name resolution in Haskell.)