Workshop › Whack-a-Mole › Step 15 of 18

Faster and faster

What we are doing

As the round goes on, moles stay up for less time (1000 ms down to 500) and come more often (every 700 ms down to 350).

```js
// Linear interpolation from the easy value to the hard value as the round goes on.
function upTime() {
  return 1000 - 500 * progress()
}

function popGap() {
  return 700 - 350 * progress()
}

      hole.upUntil = now + upTime()
    nextPop = now + popGap()
```

What it means

• 1000 - 500 * progress() is 1000 at the start, 750 halfway and 500 at the end: a straight line between the two.
• update uses these functions instead of the fixed numbers.

Your turn

1. Under progress, write the comment, upTime and popGap.
2. In update, replace 1000 with upTime() and 700 with popGap().

Skills: Game states, Functions

← How far into the round? Remember each hit →

All steps

1. A green field
2. Nine holes
3. Draw the holes
4. A clock and a loop
5. A mole in a hole
6. Moles pop up
7. Which hole was clicked?
8. Whack!
9. Show the score
10. Click to start
11. Time's running
12. Time's up
13. Best score
14. How far into the round?
15. Faster and faster
16. Remember each hit
17. Floating +1
18. Build it yourself: combos