tuple is basically a function that returns all argument as an array, so maybe we can add it here ?
tuples in hack are immutable, the length of the tuple and type of each element are immutable but values are mutable.
example :
<<__EntryPoint>>
async function main(): Awaitable<noreturn> {
$tuple = foo();
$tuple[0] = 'bar'; // fine
$tuple[1] = false; // fine
$tuple[1] = 'baz' // error
$tuple[34] = false; // error
exit(0);
}
function foo(): (string, bool) {
return tuple('hello', true);
}
to implement this, we can do :
function tuple(...$args): array {
return $args;
}but this doesn't give the same behavoir as tuples in hack.
the way to do this is create a new object Tuple as :
namespace {
function tuple(...$args): Tuple {
return new Tuple(...$args);
}
final class Tuple implements Countable, ArrayAccess, Iterator, Serializable, JsonSerializable {
public function __construct(...$elements);
}
}the Tuple class should :
- maintain the original size ( don't allow adding new elements )
- maintain the original values type ( when replacing an element, check the old element type and whether it matches )
tupleis basically a function that returns all argument as an array, so maybe we can add it here ?tuples in hack are immutable, the length of the tuple and type of each element are immutable but values are mutable.example :
to implement this, we can do :
but this doesn't give the same behavoir as tuples in hack.
the way to do this is create a new object
Tupleas :the
Tupleclass should :