public function testFlatMap()
{
$seq = new Sequence();
$seq->addAll([new Some('a'), new Some('b'), None::create(), new Some('c')]);
$this->assertEquals(['aA', 'bA', 'cA'], iterator_to_array($seq->flatMap(function ($x) {
return $x->map(function ($v) {
return $v . 'A';
});
})));
$seq = new Sequence();
$seq->addAll([[1, 2, 3, 4], [5, 6], [7]]);
$this->assertEquals([2, 3, 4, 5, 6, 7, 8], iterator_to_array($seq->flatMap(function ($x) {
return array_map(function ($v) {
return $v + 1;
}, $x);
})));
}
