Ruby an overall approach
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Ruby is a dynamic, open source programming language created in 1993 by Yukihiro Matsumoto. It was influenced by Perl, Smalltalk, Python and Lisp. Ruby supports object-oriented, imperative, and functional programming styles. Everything in Ruby is an object and has flexible typing. Ruby also features open classes and duck typing. It gained popularity with the release of the Ruby on Rails framework in 2004.
![Getting Started
HelloWorld.java
class HelloWorldApp {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}](https://image.slidesharecdn.com/rubyanoverallapproach-120426112630-phpapp01/85/Ruby-an-overall-approach-16-320.jpg)
![Types
If list is a string: โfooโ
If list is an array: [โfooโ]
If list is a stream: foo is written to stream
Ruby
def foo list
list << โfooโ
end](https://image.slidesharecdn.com/rubyanoverallapproach-120426112630-phpapp01/85/Ruby-an-overall-approach-24-320.jpg)
![Open classes
Ruby
class Array
def average
inject do |sum, var|
sum + var
end / size
end
end
nums = [1,2,3,4,5]
puts nums.average #prints: 3
Existing classes can be modi๏ฌed at any time.](https://image.slidesharecdn.com/rubyanoverallapproach-120426112630-phpapp01/85/Ruby-an-overall-approach-27-320.jpg)
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Ruby an overall approach
- 1. RUBY Felipe Schmitt an overall approach PPRO@FEUP 2012
- 3. CONTENTS โข Rubyโs history โข What is Ruby? โข Programming paradigms insight โข How it works? โข Rubyโs usage โข Where can I learn more?
- 5. Timeline: 1993 - 2000 Yukihiro Matsumoto โข Created in 1993 โข Popular only in Japan โข All documentation written in Japanese
- 6. Timeline: 2000 - 2004 โข First english language book published in 2000 โข Ruby has gained a lot of interest in Agile Development community but still unknown elsewhere
- 7. Timeline: 2004 - Today โข Ruby on Rails, the framework that allowed ruby to step up to the spotlight โข Ruby v1.9 โข Core 100% documented โข 96 standard libraries
- 9. โI wanted a scripting language that was more powerful than Perl, and more object- oriented than Python. That's why I decided to design my own language.โ -Yukihiro Matsumoto
- 10. INFLUENCES Lisp Python Ruby CLU Perl Smalltalk
- 11. WHAT IS RUBY? โขA dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write.
- 13. Multi-paradigm programming language โข Functional โข Object oriented โข Imperative โข Re๏ฌective It also has a dynamic type system and automatic memory management;
- 14. HOW IT WORKS?
- 15. VS
- 16. Getting Started HelloWorld.java class HelloWorldApp { public static void main(String[] args) { System.out.println("Hello World!"); } }
- 17. Getting Started HelloWorld.rb puts โHello World!โ No main statement No semicolons ( )โs are optional
- 18. Object Java String s = String.ValueOf(1);
- 19. Object Java String s = String.ValueOf(1); Ruby s = 1.to_s
- 20. Object Java String s = String.ValueOf(1); Ruby s = 1.to_s Everything is an object!
- 21. Types Java public void foo(ArrayList list) { list.add(โfooโ); }
- 22. Types Java public void foo(ArrayList list) { list.add(โfooโ); } Ruby def foo list list << โfooโ end
- 23. Types Java public void foo(ArrayList list) { list.add(โfooโ); } Ruby (?) return def foo list list << โfooโ end (?) Object type
- 24. Types If list is a string: โfooโ If list is an array: [โfooโ] If list is a stream: foo is written to stream Ruby def foo list list << โfooโ end
- 25. Duck Typing โIf it walks like a duck and quacks like a duck, it must be a duck.โ - Pragmatic Dave Thomas
- 26. Iterators Objects manage their own transversal Ruby array.each { |item| puts item } No for loops: Loops N + 1 errors
- 27. Open classes Ruby class Array def average inject do |sum, var| sum + var end / size end end nums = [1,2,3,4,5] puts nums.average #prints: 3 Existing classes can be modi๏ฌed at any time.
- 30. RECAP In๏ฌuences Style Overall โข Perlโs syntax โข Simplicity โข Everything is an object โข Smalltalkโs semantics โข Productivity โข Flexible โข Pythonโs design philosophy โข Elegant syntax โข Large standard library โActually, I'm trying to make Ruby natural, not simple.โ - Matz
- 31. MORE STUFF Books Beginning Ruby: From Novice to Professional (2009) The Expertโs Voice by Peter Cooper The Ruby Programming Language (2008) Oโreilly by David Flanagan and Yukihiro Matsumoto Agile Web Development with Rails (2011) 4th edition Pragmatic Programmers by Sam Ruby, Dave Thomas and David Heinemeier Hansson Web http://www.ruby-lang.org/ http://www.slideshare.net/mbowler/ruby-for-java-programmers http://www.slideshare.net/vishnu/the-top-10-reasons-the-ruby-programming-language-sucks http://www.๏ฌncher.org/tips/Languages/Ruby/