From: Jeremy Smith <jeremy.smith@...>
Date: 2006-05-27T04:54:15+09:00
Subject: Preserving Leading Zeros Using sprintf

From http://www.rubycentral.com/ref/ref_c_array.html#collect_oh:

"Invokes block once for each element of arr, replacing the element with 
the value returned by block."

Okay, so I attempt to execute the following code:


a=3
b=8
[a,b].collect! { |c| c = sprintf('%02d', c) }
puts a # prints out 3 and not 03


However, this code:


a=3
b=8
(a,b) = [a,b].collect! { |c| c = sprintf('%02d', c) }
puts a # prints out 03


Why is that?

If it's of any use, this is ruby 1.8.4 (2005-12-24) [i386-cygwin].

Thanks for demystification.

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