Introduction to JRuby
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This document discusses JRuby and Ruby programming concepts like object orientation, data types, blocks, and Ruby on Rails. It is a presentation that introduces JRuby, which allows Ruby code to run on the Java Virtual Machine. It highlights features of Ruby like dynamically typed variables, multi-paradigm programming, metaprogramming, and object orientation. Data types in Ruby like arrays, hashes, and symbols are demonstrated. Blocks and yielding in Ruby are shown as an alternative to for loops. Rails is introduced at the end along with building a sample Rails application. The document serves to educate about Ruby and promote following the Twitter handle @vagmi for more information.
![Data Types
a = [1,2,3,”hello”,[‘a’,’b’,’c’]
a << “another object” hsh = {}
a[4] hsh = {“a”=>1, “b”=>2}
=> “hello” hsh = {“asdf”=>1,2=>”asdf”}
a[4] hsh[a] = “key can be anything”
=>[‘a’,’b’,’c’]
Follow me @vagmi](https://image.slidesharecdn.com/jruby-talk-110416063531-phpapp02/85/Introduction-to-JRuby-10-320.jpg)
![Blocks
[1,2,3,4].each do |i|
puts (i*2).to_s def measure_it(&block)
end puts Time.now
2 yield
4 puts Time.now
6 end
8
Follow me @vagmi](https://image.slidesharecdn.com/jruby-talk-110416063531-phpapp02/85/Introduction-to-JRuby-13-320.jpg)
Introduction to JRuby
- 1. JRUBY A Better Java and A Better Ruby - by Vagmi Mudumbai
- 3. I hack on Follow me @vagmi
- 4. Dynamically Typed MyCollection<IMyInteface> myCollection = new MyCollection<IMyInterface>() my_collection = MyCollection.new Follow me @vagmi
- 5. Multi Paradigm Language Follow me @vagmi
- 6. Meta programming You just have to realize There is no spoon! Follow me @vagmi
- 7. Talk is cheap. Show me the code. Follow me @vagmi
- 8. Object Orientation 5.class => Fixnum class Sample class Sample def hello2 def hello puts “hello2” puts “hello” end end end end obj.hello2 obj = Sample.new obj.hello Follow me @vagmi
- 9. Object Orientation class << obj2 def hello3 obj2 = Sample.new puts “hello3” obj2.hello1 end hello end => nil obj2.hello3 obj2.hello2 hello3 hello2 => nil => nil obj.hello3 # error occurs Follow me @vagmi
- 10. Data Types a = [1,2,3,”hello”,[‘a’,’b’,’c’] a << “another object” hsh = {} a[4] hsh = {“a”=>1, “b”=>2} => “hello” hsh = {“asdf”=>1,2=>”asdf”} a[4] hsh[a] = “key can be anything” =>[‘a’,’b’,’c’] Follow me @vagmi
- 11. Data Types “asdf”.object_id =>id1 “asdf”.object_id =>id2 to the rescue Strings are mu table. Symbols :”asdf”.object_id => id3 :”asdf”.object_id => id3 :asdf.object_id => id3 Follow me @vagmi
- 12. Blocks Ruby has no for statement Follow me @vagmi
- 13. Blocks [1,2,3,4].each do |i| puts (i*2).to_s def measure_it(&block) end puts Time.now 2 yield 4 puts Time.now 6 end 8 Follow me @vagmi
- 14. But why JRuby quartz-jruby http://blog.dharanasoft.com/2010/12/03/scheduling- jobs-with-jruby/ Follow me @vagmi
- 15. Introducing Rails Follow me @vagmi
- 16. Lets build a Rails App Follow me @vagmi
- 17. Questions Follow me now @vagmi