Christos Argyropoulos MD, PhD, FASN 🇺🇸 0kale/acc#perl
sub plus {
my ($x) = @_;
sub {
my ($y) = @_;
$x + $y
}
}
my $plus_one = plus(1);
$plus_one->(10); # 11
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🔍 Spot the difference?
Both define an outer function (plus).
Both return an inner, anonymous function.
Both "close over" the variable in the parent scope.
R uses environments; Perl uses lexicals. Same logic, different syntax. 🤝
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