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

[]= 

        # OpenStruct.[]=

(from ruby core)
---
    ostruct[name] = obj  -> obj

---

Sets the value of an attribute.

    require "ostruct"
    person = OpenStruct.new("name" => "John Smith", "age" => 70)
    person[:age] = 42   # equivalent to person.age = 42
    person.age          # => 42

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.