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

<= 

        # Hash.<=

(from ruby core)
---
    hash <= other_hash -> true or false

---

Returns `true` if `hash` is a subset of `other_hash`, `false` otherwise:
    h1 = {foo: 0, bar: 1}
    h2 = {foo: 0, bar: 1, baz: 2}
    h1 <= h2 # => true
    h2 <= h1 # => false
    h1 <= h1 # => true

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.