/**
* This method tests the creation of an empty list.
*/
public function testEmpty()
{
//$this->markTestIncomplete();
$p0 = IHashSet\Type::empty_();
$this->assertInstanceOf('\\Saber\\Data\\IHashSet\\Type', $p0);
$p1 = $p0->unbox();
$e1 = 0;
$this->assertInternalType('array', $p1);
$this->assertCount($e1, $p1);
}
/**
* This method returns the latter value should the former value evaluates
* to null.
*
* @access public
* @static
* @param IHashSet\Type $xs the value to be evaluated
* @param IHashSet\Type $ys the default value
* @return IHashSet\Type the result
*/
public static function nvl(IHashSet\Type $xs = null, IHashSet\Type $ys = null) : IHashSet\Type
{
return $xs ?? $ys ?? IHashSet\Type::empty_();
}
/**
* This method returns an array list containing only unique items from the specified
* array list (i.e. duplicates are removed).
*
* @access public
* @static
* @param IArrayList\Type $xs the array list to be processed
* @return IArrayList\Type an array list with the duplicates
* removed
*/
public static function nub(IArrayList\Type $xs) : IArrayList\Type
{
$zs = IHashSet\Type::empty_();
return IArrayList\Module::filter($xs, function (Core\Type $x, IInt32\Type $i) use($zs) : IBool\Type {
if ($zs->__hasItem($x)) {
return IBool\Type::false();
}
$zs->putItem($x);
return IBool\Type::true();
});
}
