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Iterator shortcut using symbols

/ Published in: Ruby
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Extracted from "The Ruby Way: Solutions and Techniques in Ruby Programming."

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  1. class Symbol
  2.   def to_proc
  3.     proc {|obj, *args| obj.send(self, *args) }
  4.   end
  5. end
  6.  
  7. # map takes a block, & causes the interpreter to invoke to_proc on given symbol
  8. # symbol is passed as message to the object beeing processed
  9. # in other words, this is a short way of writing:
  10. # list = words.map {|x| x.capitalize }
  11. list = words.map(&:capitalize)

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