/**
* This method subscribes a listener.
*
* @access public
* @static
* @param IHashMap\Type $xs the left operand
* @param ITuple\Type $entry a tuple containing the key and listener
* @return IHashMap\Type the map
*/
public static function subscribe(IHashMap\Type $xs, ITuple\Type $entry) : IHashMap\Type
{
$k = $entry->first();
$ys = $xs->__hasKey($k) ? $xs->item($k) : ILinkedList\Type::empty_();
$ys = ILinkedList\Module::append($ys, $entry->second());
$zs = IHashMap\Module::putEntry($xs, ITuple\Type::box2($k, $ys));
return $zs;
}
/**
* This method tests the "append" method.
*
* @dataProvider data_append
*/
public function test_append(array $provided, array $expected)
{
$p0 = ILinkedList\Type::make($provided[0], '\\Saber\\Data\\IInt32\\Type');
$p1 = IInt32\Type::box($provided[1]);
$r0 = ILinkedList\Module::append($p0, $p1);
$e0 = $expected[0];
$this->assertInstanceOf('\\Saber\\Data\\ILinkedList\\Type', $r0);
$this->assertSame($e0, $r0->unbox(1));
}
/**
* This method returns the collection as a linked list.
*
* @access public
* @static
* @param IArrayList\Type $xs the operand
* @return ILinkedList\Type the collection as a linked list
*/
public static function toLinkedList(IArrayList\Type $xs) : ILinkedList\Type
{
return IArrayList\Module::foldLeft($xs, function (ILinkedList\Type $c, Core\Type $x) {
return ILinkedList\Module::append($c, $x);
}, ILinkedList\Type::empty_());
}
/**
* This method returns a linked list of values matching the specified key.
*
* @access public
* @static
* @param ILinkedList\Type $xss the linked list to be processed
* @param Core\Type $k the key associated with value to be
* plucked
* @return ILinkedList\Type a list of values matching the specified
* key
*/
public static function pluck(ILinkedList\Type $xss, Core\Type $k) : ILinkedList\Type
{
return ILinkedList\Module::foldLeft($xss, function (ILinkedList\Type $ys, IMap\Type $xs) use($k) : ILinkedList\Type {
if ($xs->__hasKey($k)) {
return ILinkedList\Module::append($ys, $xs->item($k));
}
return $ys;
}, ILinkedList\Type::empty_());
}
