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

step 

        # Date.step

(from ruby core)
---
    d.step(limit[, step=1])              ->  enumerator
    d.step(limit[, step=1]){|date| ...}  ->  self

---

Iterates evaluation of the given block, which takes a date object. The
limit should be a date object.

    Date.new(2001).step(Date.new(2001,-1,-1)).select{|d| d.sunday?}.size
                              #=> 52

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.