G'day richard.sharpe,
$var ?= "something" : "something else";
I suspect something along these lines would do what you want using existing syntax:
$var = ("something else", "something")[!!$var];
Some examples:
$ perl -E 'my $x; $x = (0,1)[!!$x]; say $x'
0
$ perl -E 'my $x = ""; $x = (0,1)[!!$x]; say $x'
0
$ perl -E 'my $x = "X"; $x = (0,1)[!!$x]; say $x'
1
From "Re^2: RFC: "assignary" operator ?= :":
$var1 ?= die "ERROR: \$var1 already set." : $var2;
You could do something rather exotic like:
$ perl -E 'my $x = ""; $x = (42, $x && die "Set: $x")[!!$x]; say $x'
42
$ perl -E 'my $x = "X"; $x = (42, $x && die "Set: $x")[!!$x]; say $x'
Set: X at -e line 1.
But ask yourself:
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Do you fully understand what's happening with that code?
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Will the next maintainer fully understand what's happening with that code?
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Wouldn't a simple if/else block be easier to write, read, understand and maintain?
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