Ruby Introduction - Speaker Deck

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RUBY INTRODUCTION Alessandro Lepore

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HISTORY ➤ Yukihiro Matsumoto (“Matz”), Japan ➤ Perl and Python…? ➤ 1995, Ruby 0.95 ➤ 2001, ﬁrst English book, “Programming Ruby” ➤ 2003, Ruby 1.8, large amounts of changes ➤ 2004, RubyGems ➤ 2005, Ruby on Rails ➤ 2011, Ruby 1.9.3 ➤ 2013-2015: Ruby 2.0, 2.1, 2.2, 2.3

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RUBY ➤ Dynamic, object-oriented, general-purpose programming language ➤ Inﬂuenced by Perl, Smalltalk, Eiﬀel, Ada, and Lisp ➤ Functional, object-oriented, and imperative ➤ Dynamic type system and automatic memory management ➤ Designed for programmer productivity and fun ➤ “…to be productive, and to enjoy programming, and to be happy. That is the primary purpose of Ruby language.” ➤ BSD / MIT license

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RUBY VS PYTHON

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RUBY ➤ Thoroughly object-oriented with inheritance, mixins and metaclasses ➤ Dynamic typing and duck typing ➤ Succinct and ﬂexible syntax that minimises syntactic noise ➤ Dynamic reﬂection and alteration of objects to facilitate metaprogramming ➤ Lexical closures, iterators and generators, with a unique block syntax ➤ Strict boolean coercion rules (everything is true except false and nil) ➤ Exception handling ➤ Custom dispatch behaviour (through method_missing and const_missing) ➤ Native plug-in API in C ➤ Interactive Ruby Shell (a REPL) ➤ Centralised package management through RubyGems ➤ Implemented on all major platforms ➤ Large standard library, many gems ➤ Multiple implementations: CRuby (MRI), JRUBY, Rubinius, MRuby

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RUBY ON RAILS ➤ Full stack web framework ➤ Optimizing for programmer happiness ➤ Convention over Conﬁguration ➤ …and other controversial points since the beginning ➤ Must read: rubyonrails.org/doctrine

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RUBY POPULARITY

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FAMOUS STUFF

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RUBY: THE BAD PARTS ➤ Performance ➤ Concurrency / Threading ➤ Alternate/less used syntaxes ➤ Dynamic typing (?) ➤ “The Standard Library is a ghetto” ➤ “Obscure” core development

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BASIC ENVIRONMENT ➤ Version manager (RVM, Rbenv..) ➤ shell ➤ ruby ➤ irb ➤ gem ➤ bundle ➤ git ➤ your favourite editor

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SHOW ME THE CODE

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GENERAL CONCEPTS

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GENERAL CONCEPTS

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CLASSES, OBJECTS

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LINKS ➤ https://www.ruby-lang.org/ ➤ http://tryruby.org/ ➤ https://rubygems.org/ ➤ http://rubyonrails.org/ ➤ https://www.ruby-toolbox.com/ ➤ http://www.helloruby.com/