I have the suspicion that this only works with sorted input while the "cheating propsosals" always work...

  DB<148> %hash=()

  DB<149> @CELLS
 => ("A-1", "A-2", "A-3", "A-4", "B-5", "B-6", "C-7", "C-8", "A-9")

  DB<150> %hash = map { /^([^-]*)-(.*)$/; if( $1 eq ($a//'-') ) { push
+ @$b, $2; () } else { ( $a = $1 => $b = [ $2 ] ) } } @CELLS;
 => ("B", [5, 6], "C", [7, 8], "A", [9])

[download]

oops, indeed! ;-)

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re^2: Generating Hash-of-List using map? by LanX
in thread Generating Hash-of-List using map? by cmv

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