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

count 

        # String.count

(from ruby core)
---
    str.count([other_str]+)   -> integer

---

Each `other_str` parameter defines a set of characters to count.  The
intersection of these sets defines the characters to count in `str`. 
Any `other_str` that starts with a caret `^` is negated.  The sequence
`c1-c2` means all characters between c1 and c2.  The backslash character
`\` can be used to escape `^` or `-` and is otherwise ignored unless it
appears at the end of a sequence or the end of a `other_str`.

    a = "hello world"
    a.count "lo"                   #=> 5
    a.count "lo", "o"              #=> 2
    a.count "hello", "^l"          #=> 4
    a.count "ej-m"                 #=> 4

    "hello^world".count "\\^aeiou" #=> 4
    "hello-world".count "a\\-eo"   #=> 4

    c = "hello world\\r\\n"
    c.count "\\"                   #=> 2
    c.count "\\A"                  #=> 0
    c.count "X-\\w"                #=> 3

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.