Here we want to create functions that allow us to count up and down a variable with a lower bound of 0.

We can achieve this easily with `Math.max()`

which returns the higher of two values. So now if count falls below 0 it will default to 0 because `Math.max(-1, 0)`

is 0.

```
countDown = (count, min = 0) => Math.max(count - 1, min)
countDown(1) // => 0
countDown(-1) // => 0
```

Similarly, if you had to set the upper bound limit of a variable, you would use `Math.min()`

because this would choose the smaller of the two numbers – `Math.min(101, 100)`

is 100.

```
countUp = (count, max = 100) => Math.min(count + 1, max)
countUp(99) // => 100
countUp(101) // => 100
```