/**
* This method publishes the message to any subscribed listerners.
*
* @access public
* @static
* @param IHashMap\Type $xs the left operand
* @param ITuple\Type $message a tuple containing the event key and
* value to be published
* @return IHashMap\Type the map
*/
public static function publish(IHashMap\Type $xs, ITuple\Type $message) : IHashMap\Type
{
$k = $message->first();
if ($xs->hasKey($k)) {
ILinkedList\Module::each($xs->item($k), function (callable $y) use($message) {
$y($message->second());
});
}
return $xs;
}
/**
* This method returns whether the specified key exists.
*
* @access public
* @static
* @param IHashMap\Type $xs the hash map
* @param Core\Type $k the key to be found
* @return IBool\Type whether the key exists
*/
public static function hasKey(IHashMap\Type $xs, Core\Type $k) : IBool\Type
{
return $xs->hasKey($k);
}