The only time I used : lvalue was in writing the following subroutine:
sub set : lvalue {
@_ == 1 ? $_[0] : set($_[0]{$_[1]},@_[2..$#_]);
}
..which is used to set values at any depth in a recursive hash structure, like so:
use Data::Dumper;
sub set : lvalue {
@_ == 1 ? $_[0] : set($_[0]{$_[1]},@_[2..$#_]);
}
my $h = {foo => 1,
bar => 2,
baz => {
troz => 3,
zort => 4,
poit => {
qux => 5,
quux => 6,
},
},
};
print Dumper($h);
set($h, qw/baz troz/) = 42;
set($h, qw/baz poit qux/) = 17;
print Dumper($h);
In this particular case, doing data verification wasn't overly useful, but I can definately see when it might be. While I'm not convinced that using $_ "won't break any existing code," it seems to be the most perlish choice to use.
perl -pe '"I lo*`+$^X$\"$]!$/"=~m%(.*)%s;$_=$1;y^`+*^e v^#$&V"+@( NO CARRIER'
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