class Range: A \Range object represents a collection of values that are between given begin and end values. literals.| 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 Regexp: en. wikipedia.| 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 Hash: A +Hash+ maps each of its unique keys to a specific value. An Array index is always an Integer.| docs.ruby-lang.org