> Performance-wise I don't think there is a difference (OSX 10.13 and perl 5.28.3):

That would be surprsing, it's compiled to the same op-code.

C:\WINDOWS\System32>perl -MO=Deparse -e"$$x{key}"
$x->{'key'};
-e syntax OK

C:\WINDOWS\System32>perl -MO=Concise -e"$$x{key}"
4  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter v ->2
2     <;> nextstate(main 1 -e:1) v:{ ->3
-     <1> ex-helem vK/2 ->4
3        <+> multideref($x->{"key"}) vK ->4
-           <0> ex-gv s ->3
-e syntax OK

C:\WINDOWS\System32>perl -MO=Concise -e"$x->{key}"
4  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter v ->2
2     <;> nextstate(main 1 -e:1) v:{ ->3
-     <1> ex-helem vK/2 ->4
3        <+> multideref($x->{"key"}) vK ->4
-           <0> ex-gv s ->3
-e syntax OK

C:\WINDOWS\System32>

[download]

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re^4: Dereferencing in blessed object by LanX
in thread Dereferencing in blessed object by Bod

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