lists() public method

Get an array with the values of a given key.
public lists ( $value, string $key = null ) : array
$key string
return array
 public function testLists()
 {
     $data = new Collection(array((object) array('name' => 'taylor', 'email' => 'foo'), (object) array('name' => 'dayle', 'email' => 'bar')));
     $this->assertEquals(array('taylor' => 'foo', 'dayle' => 'bar'), $data->lists('email', 'name'));
     $this->assertEquals(array('foo', 'bar'), $data->lists('email'));
 }