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

bsearch_index 

        # Array.bsearch_index

(from ruby core)
---
    array.bsearch_index {|element| ... } -> integer or nil
    array.bsearch_index -> new_enumerator

---

Searches `self` as described at method #bsearch, but returns the *index*
of the found element instead of the element itself.

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.