function _flatten($array, $shallow = false)
{
return Underscore::flatten($array, $shallow);
}
/**
* @tags arrays
*/
public function testFlatten()
{
// it should flatten arrays
$this->array(_::flatten([[1], [2], [3]]))->isEqualTo([1, 2, 3]);
$this->array(_::flatten([[1, 2], [3, 4]]))->isEqualTo([1, 2, 3, 4]);
// it should deep-flatten arrays by default
$this->array(_::flatten([[[1]], [[2]], [[3]]]))->isEqualTo([1, 2, 3]);
// it should be possible to obtain a shallow copy
$this->array(_::flatten([[[1]], [[2]], [[3]]], true))->isEqualTo([[1], [2], [3]]);
// it should work on arrays objects an iterators
$this->typeTolerant([[1, 2], [3, [4]]], [1, 2, 3, 4], function ($in, $out) {
$this->array(_::flatten($in))->isEqualTo($out);
}, [1, -1]);
// it should return an empty array if list is empty
$this->array(_::flatten(null))->isEqualTo([]);
}