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

delete! 

        # String.delete!

(from ruby core)
---
    str.delete!([other_str]+)   -> str or nil

---

Performs a `delete` operation in place, returning *str*, or `nil` if
*str* was not modified.

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.