class Symbol: A +Symbol+ object represents a named identifier inside the Ruby interpreter. literals.| docs.ruby-lang.org
class StringIO: IO].| 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 Rational: b (b>0), where a is the numerator and b is the denominator. mathematically.| 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 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 Hash: A +Hash+ maps each of its unique keys to a specific value. An Array index is always an Integer.| 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
Redmine| bugs.ruby-lang.org
comments: inline and block. code>.| docs.ruby-lang.org
class Thread: Threads are the Ruby implementation for a concurrent programming model. Programs that require multiple threads of execution are a perfect candidate fo| 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