tinypig

Maybe you know the feeling… you go to add an option to that method or subroutine and… cue Jaws theme

sub update_shopping_cart {
    my $cart_id        = shift;
    my $item           = shift;
    my $quantity       = shift;

Argh. You don’t want your legacy code to break but you also don’t want to add a fourth unnamed parameter to the existing problem. And the solution is simple:

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