From: matt_neuburg@... (Matt Neuburg)
Date: 2009-06-14T01:55:12+09:00
Subject: Re: Last element skip in array mapping

Len Lawrence <lcl@tarazed.demon.co.uk> wrote:

> 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?

Consider:

puts [1].join("0")
puts [1, nil].join("0")

m.