Slides for the talk given at http://jugchennai.in/chennaijavasummit/.

1. JRUBY
A Better Java and A Better Ruby - by Vagmi Mudumbai

2. Who am I
http://www.dharanasoft.com
RailsPundit
http://www.railspundit.com

3. I hack on
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4. Dynamically Typed
MyCollection<IMyInteface> myCollection = new MyCollection<IMyInterface>()
my_collection = MyCollection.new
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5. Multi Paradigm Language
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6. Meta programming
You just have to realize
There is no spoon!
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7. Talk is cheap.
Show me the code.
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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
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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
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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’]
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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
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12. Blocks
Ruby has no for statement
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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
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14. But why JRuby
quartz-jruby
http://blog.dharanasoft.com/2010/12/03/scheduling-
jobs-with-jruby/
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15. Introducing Rails
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16. Lets build a Rails App
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17. Questions
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