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Welcome to the fourth post of this series. Just before proceeding to the questions, I would like to mention the great Metaprogramming Ruby: Program Like the Ruby Pros book by Paolo Perrotta,[...]
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Scala is my next choice
Ruby 1.9 has a great support for encoding, this post covers that for a big deal, however with this support out of the box, things like this becomes easier, just note the source code is not limited to few types of encoding just like Ruby 1.8.
# coding: UTF-8 π = Math::PI def √(x) Math.sqrt(x) end def ∑(r) r.inject{|sum,val| sum + (block_given? ? yield(val) : val)} end def ∏(r) r.inject(1){|mul,val| mul * (block_given? ? yield(val) : val)} end def ¬(x) !x end p π #=> 3.14159265358979 p √(9) #=> 3.0 range = 1..6 p ∑(range) #=> 21 p ∑(range){|x| x**2} #=> 91 p ∏(range) #=> 720 p ∏(range){|x| x**2} #=> 518400 p ¬(5>0) #=> false
Please note that previous example could work also with Ruby 1.8 using the flag -Ku, I just wanted to explain the idea of using different types of encoding in Ruby 1.9.
So all you need to do is to set whatever encoding you want for your source code at the very beginning of the file:
# coding: UTF-8Many other things can be done, just give yourself a moment and think what you can do!
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Rails Magazine Contributing Editor
Moski | July 13th, 2009 at 6:00 am #
This is really cool, i luv it
Francky | July 13th, 2009 at 6:04 am #
very usefull and human!!
El Cy | July 13th, 2009 at 7:30 am #
So Ruby is “stealing” from Scala now
… Nice cross-polination !
Buck | July 13th, 2009 at 9:57 am #
Now I can run the code examples from Alonzo Church’s text on the Lambda Calculus, verbatim. Sweet!