Introduction to Ruby & Modern Programming
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A brief introduction to Ruby programming language using some modern programming techniques and concepts.
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Introduction to Ruby & Modern Programming
- 1. Introduction to Ruby & Modern Programming Christos Sotirelis www.sotirelischristos.com December 2015
- 2. What am I doing here?
- 3. Our goal Meet Ruby and modern programming See how to benefit from Ruby Learn some Ruby basics Prepare to dive in Rails and modern web applications Keep the journey going
- 5. What is Ruby? o Dynamic, interpreted, object-oriented programming language written in C o Expressive and declarative o Invented by Yukihiro “Matz” Matsumoto in 1996 but was popularized by Ruby on Rails in 2005 o Influenced by Perl, Python, Smalltalk, Eiffel, Ada, Lisp o Designed to make programmers happy o Open source
- 7. Why Ruby? o Very well documented o Highly readable o Multi-paradigm o Memory-managed and garbage-collected o Built-in data structures o Many more..
- 8. Getting on Cloud9 https://c9.io/ “SIGN UP” or “TRY IT NOW” Create a new workspace “Ruby on Rails Tutorial” template
- 9. The IRB On Cloud9’s terminal: irb Alternatively, save your Ruby code with .rb extension and run with: ruby <file.rb>
- 11. Procedural
- 13. OO Ruby In a website, a User is a class It has fields, such as an email and a password It also has methods, such as register() and login() We can create objects (or instances) of a class, such as user1, user2 and so on We can also access their fields, like user1.email and user1.password Most importantly, we can use class methods on our objects, like user2.register() or user2.login() In a traditional, non-OO system, we would have to use many different variables and methods for every user we had (too much space)
- 14. OO Ruby
- 15. Procedural + Object-Oriented + Functional
- 16. Functional?
- 17. Chained methods
- 18. Java VS. Ruby In Ruby, everything is an object!
- 19. is actually that: So this..
- 20. Tell me 10 random methods of you Hey 10, what are you?
- 22. Syntactic sugar
- 23. Parentheses and semicolons are optional
- 24. Dynamic typing
- 25. Duck typing “If it walks like a duck and quacks like a duck, then it must be a duck.”
- 28. Ruby loops ..much better this way! Too old style..
- 30. Methods Multiple returns plus syntactic sugar
- 31. Arrays & hashes
- 32. Arrays & hashes Arrays and hashes in Ruby are more like collections They respond to same methods We can think of arrays as dynamic lists Arrays are also type-agnostic
- 33. Arrays
- 34. Hashes Hashes are pairs of unique keys and values Hashes (and arrays) include the Enumerable mixin
- 36. Open classes In Ruby, classes are never closed: methods can always be added to an existing class Applies to all classes, including the standard, built-in classes If not cautious, bad things are bound to happen
- 37. Metaprogramming & reflection In Ruby, code can be programmatically modified at runtime Writing code that writes code Classes and methods know about themselves
- 39. Ruby gems Libraries in Ruby are called gems Can be installed with “gem install capistrano” View locally installed gems with “gem list”
- 40. Simple deck with cards Save as cards.rb and run with “ruby cards.rb”
- 41. Look up on your own method_missing Mixins Introspection Exceptions Procs & lambdas Multithreading File I/O Sockets Regular expressions (Unit) Testing
- 42. More about Ruby https://www.ruby-lang.org https://www.codecademy.com http://www.tryruby.org http://www.ruby-doc.org http://www.sitepoint.com/ruby
- 43. Thank you! you.ask(me) or you.email(me) if any_questions? you.applause www.sotirelischristos.com