Re^2: More efficient dereferencing of a subroutine return

If the dereferencing of an array returned by a function is my $arrayref = \@{ function() } then how does that work with the keys() function?

I tried my $arrayref = \@{ keys(%$someHashRef) || [] } but something makes it break.

What makes the keys() function a special case?

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Re^3: More efficient dereferencing of a subroutine return by choroba (Cardinal) on Apr 12, 2021 at 13:27 UTC
You say "dereferencing", but at the same time "$arrayref". That's confusing. To dereference an array reference returned from a subroutine, you can use: `my @array = @{ sub_returning_aref() };` [download] To get the actual reference, no dereferencing is needed: `my $aref = sub_returning_aref();` [download] On the other hand, if a subroutine returns a list, you can assign it directly to an array: `my @array = sub_returning_list();` [download] To create an array reference, you need to create an anonymous array, as the subroutine returns a list, not an array. `my $aref = [ sub_returning_list() ];` [download] There's nothing special about keys. `my @array = keys %hash; my $aref = [ keys %hash ];` [download] `map{substr$_->[0],$_->[1]\|\|0,1}[\\|\|{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^ARGV,3]`	[reply] [d/l] [select]
Re^4: More efficient dereferencing of a subroutine return by mrbark (Acolyte) on Apr 12, 2021 at 13:39 UTC
Ah! Indeed... I must still be asleep... :) I meant referencing, not DEreferencing, so `[ keys %hash ]` is what I was looking for. Thank you!	[reply] [d/l]