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Introduction to Ruby & Modern Programming
The document is an introduction to Ruby, a dynamic, interpreted, object-oriented programming language, highlighting its features and benefits such as readability and multiple paradigms. It covers basic concepts including classes, methods, and the unique aspects of Ruby like dynamic typing and metaprogramming. Additionally, resources for further learning about Ruby and its applications, such as Ruby on Rails, are provided.
Introduction to Ruby & Modern Programming
- 1. Introduction to Ruby& Modern Programming Christos Sotirelis www.sotirelischristos.com December 2015
- 2. What am Idoing here?
- 3. Our goal MeetRuby 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
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- 5. What is Ruby? oDynamic, 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
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- 7. Why Ruby? o Verywell 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’sterminal: irb Alternatively, save your Ruby code with .rb extension and run with: ruby <file.rb>
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- 13. OO Ruby Ina 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)
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- 15. Procedural + Object-Oriented+ Functional
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- 18. Java VS. Ruby InRuby, everything is an object!
- 19. is actually that: Sothis..
- 20. Tell me 10random methods of you Hey 10, what are you?
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- 23. Parentheses and semicolonsare optional
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- 25. Duck typing “If itwalks like a duck and quacks like a duck, then it must be a duck.”
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- 28. Ruby loops ..much betterthis way! Too old style..
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- 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
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- 34. Hashes Hashes arepairs of unique keys and values Hashes (and arrays) include the Enumerable mixin
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- 36. Open classes InRuby, 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
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- 39. Ruby gems Librariesin Ruby are called gems Can be installed with “gem install capistrano” View locally installed gems with “gem list”
- 40. Simple deck withcards Save as cards.rb and run with “ruby cards.rb”
- 41. Look up onyour 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) oryou.email(me) if any_questions? you.applause www.sotirelischristos.com