This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Integer.pred (from ruby core) --- pred -> next_integer --- Returns the predecessor of `self` (equivalent to `self - 1`): 1.pred #=> 0 -1.pred #=> -2 Related: Integer#succ (successor value).
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.