/**
* @param callable $filter
* @return mixed
*/
public function first(callable $filter = null)
{
$items = $this->toArray();
return Arrays::first($items, $filter);
}
/**
* @dataProvider dataGroupsProvider
*
* @param $callbacks
* @param $array
* @param $expect
*/
public function testGroups($callbacks, $array, $expect)
{
$actual = Arrays::groups($array, $callbacks);
$this->assertEquals($expect, $actual);
$this->assertEquals(json_encode($expect), json_encode($actual));
}
/**
* @dataProvider callbackDataProvider
*
* @param $method
* @param $callback
* @param $expect
* @param $value
* @param $key
*/
public function testCallbacks($method, $callback, $initial, $expect, $value, $key = null)
{
$actual = Arrays::reduce($value, $callback, $initial);
$this->assertEquals($expect, $actual, $method);
}
