This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Hash.key? (from ruby core) --- key?(p1) --- Methods #has_key?, #key?, and #member? are aliases for #include?. Returns `true` if `key` is a key in `self`, otherwise `false`. (This method is an alias for Hash#include?.) Methods #has_key?, #key?, and #member? are aliases for #include?. Returns `true` if `key` is a key in `self`, otherwise `false`.
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.