public function flatten_with_mapper()
{
$this->assertSequence(['a', 'b', 'c', 'd'], Sequence::of(['a', 'c'])->flatten(function ($e) {
return Sequence::iterate($e, function ($n) {
return ++$n;
})->limit(2);
}));
}
public function invalid_type_for_iterate($input)
{
Sequence::iterate(0, $input);
}
public function stops_at_nth_iterator_element()
{
$this->assertSequence([1, 2], Sequence::iterate(1, function ($i) {
return ++$i;
})->limit(2));
}