public function completeItem($id) : JsonResponse
{
$status = Nullable::fromValue($id)->reject('')->map('intval')->filter(P::lt(0))->flatMap(Item::class . '::findNullable')->map(function ($item) {
return $item->setStateId(State::of('completed')->id)->save();
})->getOrThrow(new \RuntimeException("Item by ID {$id} not found!"));
return response()->json(['status' => $status, 'id' => $id]);
}
public function testLt()
{
$greaterThan2 = P::lt(2);
$lessThan = P::flip('P::lt', 2);
$lessThan2 = $lessThan(2);
$this->assertFalse(P::lt(4, 2));
$this->assertTrue(P::lt(0, 2));
$this->assertTrue($lessThan2(1));
$this->assertTrue($greaterThan2(3));
}