From: Len Lawrence <lcl@...>
Date: 2009-06-14T01:00:13+09:00
Subject: Last element skip in array mapping

Still a newbie after 2 years, investigating obscure corners of the 
language (version 1.8).  I made some tests based on a discussion in 
_why's "bits" RedHanded blog:

a = [ 1, 2, 3, 4, 5, nil ]
b = [ 1, 2, 3, 4, 5 ]
x = a.map { |k| k.to_s }.join( "0\n" )
puts x

s = a.map { |k| k }.join( "0\n" )
puts s

z = a.to_a.join( "00\n" )
puts z

beep = b * "000\n"
puts beep

Unless the dummy element is added to the array (as in a) the series does 
not complete for any of the mapping methods.  Am I missing something here?

Len