This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# String.sum (from ruby core) --- str.sum(n=16) -> integer --- Returns a basic *n*-bit checksum of the characters in *str*, where *n* is the optional Integer parameter, defaulting to 16. The result is simply the sum of the binary value of each byte in *str* modulo `2**n - 1`. This is not a particularly good checksum.
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.