Rails - Sep 2007 - was just going through the section15.6 of agile web development PDF but somehow couldn't understand how actually the & parameter works .

Hi,

I was just going through the section15.6 of agile web development PDF
but somehow couldn''t understand how actually the & parameter works
.



Check 15.6 An Extension to Ruby Symbols from agile web development
PDF .

15.6



groups = posts.group_by {|post| post.author_id}

# Rails has a shorthand notation for this. We could have written this
code as

groups = posts.group_by(&:author_id)



they say that & uses a proc function given below ,but the function is
even more confusing. .



class Symbol

  def to_proc

      Proc.new { |obj, *args| obj.send(self, *args) }

  end

end



please do reply back if u have any solutions

Thank you





Regards,

Piyush Gupta

99161-33729

http://ctrlshiftesc.blogspot.com/


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