From: Sebastian Hungerecker <sepp2k@...>
Date: 2008-03-04T01:29:31+09:00
Subject: Re: Need some explnation to_proc

vishy wrote:
> What is x and *args in to_proc ?

They're the arguments to the block:
If you words.map, map will basically do:
yield "Jane"
yield "aara"
yield "multiko"
Those will be the values for x on each iteration of the block. If you'd use a 
method that yielded multiple values at once, the additional ones would go 
into args. Example:
class Integer
  def foo(other)
    puts self+other
  end
end
[1,5,3].each_with_index(&:foo), would do the following:
yield 1,0 # x = 1, args = [0]
yield 5,1 # x = 5, args = [1]
yield 3,2 # x = 3, args = [2]
which would result in the following method calls:
1.foo 0
5.foo 1
3.foo 2
and the following output:
1
6
5


HTH,
Sebastian
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