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Not a bug. As $_{A} (did you mean $_->{A} perchance?), is undef, all hash keys 'B' that have a non-true value are (re)set to undef:

C:\test>junk Use of uninitialized value $_{"A"} in concatenation (.) or string at C +:\test\ line 13. $_{A} ::=> $VAR1 = [ { 'A' => 1, 'B' => undef }, { 'A' => 2, 'B' => 2 }, { 'A' => 2, 'B' => undef } ];

Might have expected a warning though?

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In reply to Re: Scalar followed by parenthetical... by BrowserUk
in thread Scalar followed by parenthetical... by Anonymous Monk

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