class Range: A \Range object represents a collection of values that are between given begin and end values. literals.| docs.ruby-lang.org
literals: Literals Literals create objects you can use in your program. Backtick Literals}[#label-25x-3A+Backtick+Literals] == Boolean and Nil Literals +nil+| docs.ruby-lang.org
class Array: en. wikipedia.| docs.ruby-lang.org
class String: A +String+ object has an arbitrary sequence of bytes, typically representing text or binary data. new or as literals.| docs.ruby-lang.org
class Proc: A +Proc+ object is an encapsulation of a block of code, which can be stored in a local variable, passed to a method or another Proc, and can be called| 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 Hash: A +Hash+ maps each of its unique keys to a specific value. An Array index is always an Integer.| 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
class Ractor: Ractor is an Actor-model abstraction for Ruby that provides thread-safe parallel execution. Ractor.| docs.ruby-lang.org