A Range object represents a collection of values that are between given begin and end values.| docs.ruby-lang.org
CSV¶ ↑| docs.ruby-lang.org
A Hash maps each of its unique keys to a specific value.| docs.ruby-lang.org
An instance of class IO (commonly called a stream) represents an input/output stream in the underlying operating system. Class IO is the basis for input and output in Ruby.| docs.ruby-lang.org
Public Instance Methods| docs.ruby-lang.org
What’s Here¶ ↑| docs.ruby-lang.org
A Hash is a built-in data structure in Ruby that maps values to keys and has a constant-time O(1) lookup. This article shows the capabilities of this simple, but equally powerful tool. We’ll start with the basics but also cover some obscure but equally useful features of hash.| Write Software, Well
An Array is an ordered, integer-indexed collection of objects, called elements. Any object (even another array) may be an array element, and an array can contain objects of different types.| docs.ruby-lang.org
