this is ruby test

This document provides a summary of Ruby syntax and language elements including: - Comments, expressions, and reserved words - Basic types like numbers, strings, arrays, and hashes - Regular expressions - Classes, modules, and method definitions - Exceptions, blocks, procs, and more - Operators and precedence - Common built-in global variables and constants It covers the general syntax rules and semantics of the Ruby language in a quick reference style with many code examples in about 3 sentences or less per topic.