private function make_static_stream()
{
return Stream::make(10, 20, 30);
}
public static function range($low = null, $high = null)
{
if ($low === null) {
$low = 1;
}
if ($low == $high) {
return Stream::make($low);
}
return new Stream($low, function () use($low, $high) {
return Stream::range($low + 1, $high);
});
}
