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

squeeze! 

        # String.squeeze!

(from ruby core)
---
    str.squeeze!([other_str]*)   -> str or nil

---

Squeezes *str* in place, returning either *str*, or `nil` if no changes
were made.

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.