This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

delete 

        # Set.delete

(from ruby core)
---
    delete(o)

---

Deletes the given object from the set and returns self. Use
`subtract` to delete many items at once.

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.