How do I correctly use setInterval and clearInterval to switch between two different functions?

Question

For practice I am trying to display a number that increments from 0 - 9, then decrements from 9 - 0, and infinitely repeats.

The code that I have so far seems to

Answer 1

try this:

...


    

    From 0 - 9, up and down:  

you could also create a single reference to #here element. Use always === instead of ==