in reply to Abusing Map
You could do:
@b = map{ $a[ $_-1 ] + $a[ $_ ] } 1 .. $#a;
For small arrays, it doesn't cost too much.
Update: corrected bounds as pointed out by AnomalousMonk
But post-fix for is probably better:
$b[ $_-1 ] = $a[ $_-1 ] + $a[ $_ ] for 1 .. $#a;
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
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