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gav (2710)

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Hacker in NYC.

Journal of gav (2710)

Wednesday December 08, 2004
02:36 PM


[ #22214 ]

I've been finding more and more uses for Hash::AsObject recently, it's great when you need an object, but you don't really care what that object is. For example today I had to write some reporting code, and call some existing code that expected a "cart" object to be passed in. It did something like:

foreach my $item ($cart->contents) {
    printf "%d of %s for \$%.2f\n",
        $item->qty, $item->code, $item->unit_price;

The problem was that I didn't have a "cart" to pass it. One of the great things about dynamic languages is that it doesn't matter if it's a "cart" or not, just that it looks like a cart:

my @cart = map {
    $_->{unit_price} = defined $_->{sale_price}
        ? $_->{sale_price} : $_->{price};
} @{ $dbh->selectall_arrayref(
        'SELECT qty, code, price, sale_price FROM cart',
        { Slice => {} }

my $cart = Class::Object->new;
$cart->sub('contents', sub { return @cart });

Class::Object is useful in this case to get around the issue of not being able to return a list.

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