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

tr 

        # String.tr

(from ruby core)
---
    str.tr(from_str, to_str)   => new_str

---

Returns a copy of `str` with the characters in `from_str` replaced by
the corresponding characters in `to_str`.  If `to_str` is shorter than
`from_str`, it is padded with its last character in order to maintain
the correspondence.

    "hello".tr('el', 'ip')      #=> "hippo"
    "hello".tr('aeiou', '*')    #=> "h*ll*"
    "hello".tr('aeiou', 'AA*')  #=> "hAll*"

Both strings may use the `c1-c2` notation to denote ranges of
characters, and `from_str` may start with a `^`, which denotes all
characters except those listed.

    "hello".tr('a-y', 'b-z')    #=> "ifmmp"
    "hello".tr('^aeiou', '*')   #=> "*e**o"

The backslash character `\` can be used to escape `^` or `-` and is
otherwise ignored unless it appears at the end of a range or the end of
the `from_str` or `to_str`:

    "hello^world".tr("\\^aeiou", "*") #=> "h*ll**w*rld"
    "hello-world".tr("a\\-eo", "*")   #=> "h*ll**w*rld"

    "hello\r\nworld".tr("\r", "")   #=> "hello\nworld"
    "hello\r\nworld".tr("\\r", "")  #=> "hello\r\nwold"
    "hello\r\nworld".tr("\\\r", "") #=> "hello\nworld"

    "X['\\b']".tr("X\\", "")   #=> "['b']"
    "X['\\b']".tr("X-\\]", "") #=> "'b'"

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.