class OptionParser: tutorial. rdoc].| docs.ruby-lang.org
class Range: A \Range object represents a collection of values that are between given begin and end values. literals.| docs.ruby-lang.org
class Integer: An \Integer object represents an integer value. literals.| docs.ruby-lang.org
class Object: Object is the default root of all Ruby objects. Object inherits from BasicObject which allows creating alternate object hierarchies.| docs.ruby-lang.org
class Numeric: Numeric is the class from which all higher-level numeric classes should inherit. Numeric allows instantiation of heap-allocated objects.| docs.ruby-lang.org
class Float: A \Float object represents a sometimes-inexact real number using the native architecture's double-precision floating point representation. Floating po| docs.ruby-lang.org
class Complex: i>. en.| docs.ruby-lang.org
module Kernel: The Kernel module is included by class Object, so its methods are available in every Ruby object. The Kernel instance methods are documented in class| docs.ruby-lang.org
ractor: Ractor - Ruby's Actor-like concurrent abstraction Ractor is designed to provide a parallel execution feature of Ruby without thread-safety concerns.| docs.ruby-lang.org