Was just going through the section15.6 of agile web developm

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 G.

99161-33729

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