New hash: 

my %hash = (
   ( map { $_=>'toto' } qw( a b c f t u ) ),
   ( map { $_=>'titi' } qw( b g k p ) ),
);

[download]

Existing hash: 

$hash{$_} = 'toto' for qw( a b c f t u );
$hash{$_} = 'titi' for qw( b g k p );

[download]

You have "b" twice, which means one (the earlier one) will get erased.

In reply to Re: Hash multiple initialization by ikegami
in thread Hash multiple initialization by Anonymous Monk

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