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Re: Scalar followed by parenthetical...

by LanX (Chancellor)
on May 19, 2013 at 03:34 UTC ( #1034187=note: print w/replies, xml ) Need Help??

in reply to Scalar followed by parenthetical...

ehm ... something completely different!

If you meant to write:

$_->{B} ||= $_->{A} foreach @h;

you should be warned about another bug!

I doubt that you really want $_->{B} to be overwritten if it's 0 or "".

Always use defined-or // to check for undef!

Cheers Rolf

( addicted to the Perl Programming Language)

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Re^2: Scalar followed by parenthetical...
by Anonymous Monk on May 19, 2013 at 04:36 UTC
    actually I did want $_->{B} to be overwritten... just got bitten in my code where I forgot the "->" for the "A" side, but didn't see a warning. Thanks all!
      Thanks for sharing your error. I learned a lot from the explanations.

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[Corion]: Hmmm. I feel a Meditation coming on. I wrote a module, DBIx::PivotQuery, which returns a table-like set of rows (AoA) but some columns are generated from column values, like in an (Excel) pivot table or a ROLLUP command
[Corion]: My current approach for subtotals involves rerunning the given query, with the hint to the user that they should use a temporary table if they want better performance.
[Corion]: But I could create that temporary table in the module and use it for the improved perfomance directly instead.
[Corion]: And the question is, what would be better/preferred ;-)
[Corion]: Hmm - not exactly like the ROLLUP command. Ah well.
[hippo]: Make it an option?

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