public static final function elementAt(array $array, $offset) : OptionalInterface
{
foreach ($array as $key => $value) {
if ($key === $offset) {
return Optional::of($value);
}
}
return Optional::absent();
}
public static final function elementAt(\Traversable $traversable, $position) : OptionalInterface
{
$i = 0;
foreach ($traversable as $value) {
if ($i == $position) {
return Optional::of($value);
}
}
return Optional::absent();
}
public function testOfEmpty()
{
$o = Optional::OfEmpty(0);
$this->assertInstanceOf(Optional::class, $o);
$this->assertInstanceOf(OptionalInterface::class, $o);
$this->assertTrue($o->isAbsent());
$this->assertFalse($o->isPresent());
$o = Optional::OfEmpty([]);
$this->assertInstanceOf(Optional::class, $o);
$this->assertInstanceOf(OptionalInterface::class, $o);
$this->assertTrue($o->isAbsent());
$this->assertFalse($o->isPresent());
}