class Struct: Class \Struct provides a convenient way to create a simple class that can store and fetch values. tt>; the first argument, a string, is the name of th| docs.ruby-lang.org
module Enumerable: Enumerable@Methods+for+Iterating] - {And more. tt>, +false+ otherwise.| docs.ruby-lang.org
class Array: en. wikipedia.| docs.ruby-lang.org
class Hash: A +Hash+ maps each of its unique keys to a specific value. An Array index is always an Integer.| docs.ruby-lang.org