public function testEmptyOrNot()
{
$opt = Optional::fromNullable([0, 1, 2]);
$this->assertFalse($opt->isEmpty());
$this->assertEquals([0, 1, 2], $opt->get());
$opt = Optional::fromNullable(null);
$this->assertTrue($opt->isEmpty());
try {
$opt->get();
} catch (\BadMethodCallException $ex) {
return;
}
$this->fail('An expected exception has not been raised.');
}
/**
* Reduce the stream using the given function. The reduce method will be called with
* two Optional value.
*
* @param callable|functions\BiFunction $reducer The reduce function to apply.
* @param mixed $default Default value
*
* @return Optional Value after the reduce operation if exists.
*/
public function reduceWithDefault($reducer, $default)
{
$res = $this->reduce($reducer);
return $res->isEmpty() ? Optional::fromNullable($default) : $res;
}
