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

environment 

        # OptionParser.environment

(from ruby core)
---
    environment(env = File.basename($0, '.*'))

---

Parses environment variable `env` or its uppercase with splitting like a
shell.

`env` defaults to the basename of the program.

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.