From: Chad Perrin <code@...>
Date: 2011-05-27T02:38:45+09:00
Subject: Re: "Local variable within code blocks do not interfere with those outside the block"

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On Thu, May 26, 2011 at 06:20:14PM +0900, Bala TS wrote:
> Here x is a variable(array_variable) it contains  5 elements
>=20
> x =3D [1,2,3,4,5]
>=20
>=20
> x.each do |r|{puts "#{r}"}
> end

This code is not correct -- and furthermore, the interpoation syntax you
are using is unnecessary.  Try this:

    x.each {|r| puts r }

The block variable should be identified *inside* the opening of the
block, and when using braces you do not need "do" and "end".
Alternatively, if you want to use "do" and "end", you do not need braces:

    x.each do |r|
      puts r
    end

The only reason to use the interpolation syntax here is if you want to
output more than just the contents of the block variable:

    x.each {|r| puts "At #{Time.now}, r contains #{r}."; sleep 3 }
    At Thu May 26 11:37:25 -0600 2011, r contains 1.
    At Thu May 26 11:37:28 -0600 2011, r contains 2.
    At Thu May 26 11:37:31 -0600 2011, r contains 3.
    At Thu May 26 11:37:34 -0600 2011, r contains 4.
    At Thu May 26 11:37:37 -0600 2011, r contains 5.
    =3D> [1, 2, 3, 4, 5]

--=20
Chad Perrin [ original content licensed OWL: http://owl.apotheon.org ]

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