module Marshal: The marshaling library converts collections of Ruby objects into a byte stream, allowing them to be stored outside the currently active script. This d| docs.ruby-lang.org
module JSON: JavaScript \Object Notation (\JSON) \JSON is a lightweight data-interchange format. tt>.| docs.ruby-lang.org
class Integer: An \Integer object represents an integer value. literals.| 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 Hash: A +Hash+ maps each of its unique keys to a specific value. An Array index is always an Integer.| docs.ruby-lang.org