The or-trick can't be used with multiple (list-) assignments. The code
my ($price, $floor) = get_price_floor() || 0;
sub get_price_floor {
return (10, 8);
}
is parsed as
my ($price, $floor) = (get_price_floor() || 0);
which means that
get_price_floor() is called in scalar context. Consequently, the return statement happens in scalar context which means that
(10, 8) evaluates to
8 (the scalar comma operator). That is assigned to
$price while
$floor comes out undefined.
Since you have defined get_price_floor() yourself, it isn't quite clear why you want to prepare for the case it doesn't return anything -- you *know* what it returns.
If you have to do that, one way would be the not particularly attractive
my ($price, $floor);
(($price, $floor) = get_price_floor()) ||
(($price, $floor) = ( 0, 0));
Also note I have removed the ampersand from the calls to
get_price_floor(). It isn't necessary and, in fact, has side effects you normally don't want.
Anno
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