This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Addrinfo.ipv4_loopback? (from ruby core) --- ipv4_loopback?() --- Returns true for IPv4 loopback address (127.0.0.0/8). It returns false otherwise.
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.