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Postings from October 2016
On Thu, Oct 6, 2016 at 6:07 PM, Tony Cook <tony@develop-help.com> wrote:
>
> It doesn't:
>
> $ perl -MData::Dumper -e 'sub x {} %x = ( foo => x() => bar => 1 ); print
> Dumper(\%x)'
> $VAR1 = {
> 'foo' => 'bar',
> '1' => undef
> };
>
> => only differs from the comma operator in that it quotes identifiers
> given as its left argument.
>
Drat. Wrapping in scalar works though:
$ perl -MData::Dumper -e 'sub x {} %x = ( foo => scalar(x()) => bar => 1 );
print Dumper(\%x)'
$VAR1 = {
'bar' => 1,
'foo' => undef
};
Also, if you're following the Best Practice of naming all the values prior
to constructing hashes, you can leave things out with the ternary operator
without it being that unclear:
$ perl -MData::Dumper -e 'sub x {} %x = ( ( $foo ? (foo => $foo) : ()), bar
=> 1 ); print Dumper(\%x)'
$VAR1 = {
'bar' => 1
};
--
"Teaching radical novelties is our main safeguard against dictatorships"
-- Edsger W. Dijkstra
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