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

<< 

        # IO.<<

(from ruby core)
---
    self << object -> self

---

Writes the given `object` to `self`, which must be opened for writing
(see [Modes](#class-IO-label-Modes)); returns `self`; if `object` is not
a string, it is converted via method `to_s`:

    $stdout << 'Hello' << ', ' << 'World!' << "\n"
    $stdout << 'foo' << :bar << 2 << "\n"

Output:

    Hello, World!
    foobar2

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.