/**
* Returns the gap between this lap and the given lap
*
* @return float|null
*/
public function getGap(Lap $lap)
{
// Given lap or this lap has no time
if ($lap->getTime() === null or $this->getTime() === null) {
return null;
}
// Return difference and round to 4 to fix floats
return round($lap->getTime() - $this->getTime(), 4);
}