Math.floor(): down means to minus infinity

Useful to know

Math.floor() returns the largest integer that is not greater than the input. Math.floor(2.8) is 2, but Math.floor(-2.8) is -3. [1]

This is convenient when dividing values at intervals, when looking for the lower mathematical limit. Don't just call it "waiving the decimal": for negative numbers, this would give another result. If the range in the application includes both directions around zero, check the boundary examples before using floor for cell or group numbers.