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

size 

        # Enumerator.size

(from ruby core)
---
    e.size          -> int, Float::INFINITY or nil

---

Returns the size of the enumerator, or `nil` if it can't be calculated
lazily.

    (1..100).to_a.permutation(4).size # => 94109400
    loop.size # => Float::INFINITY
    (1..100).drop_while.size # => nil

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.