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Re^7: Perl Idioms Explained - keys %{{map{$_=>1}@list}}

by Roy Johnson (Monsignor)
on Mar 02, 2005 at 16:11 UTC ( #435898=note: print w/ replies, xml ) Need Help??

in reply to Re^6: Perl Idioms Explained - keys %{{map{$_=>1}@list}}
in thread Perl Idioms Explained - keys %{{map{$_=>1}@list}}

I would not have expected #3's behavior. Would you? I think it merits an "undef is not a listop" warning. The correct way to undef the values is: @h{qw|a b c|} = ();
The correct way to autovivify them but leave them unmodified if they already exist is () = \@h{qw(a b c)};

Caution: Contents may have been coded under pressure.

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