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

value 

        # Thread.value

(from ruby core)
---
    thr.value   -> obj

---

Waits for `thr` to complete, using #join, and returns its value or
raises the exception which terminated the thread.

    a = Thread.new { 2 + 2 }
    a.value   #=> 4

    b = Thread.new { raise 'something went wrong' }
    b.value   #=> RuntimeError: something went wrong

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.