pxt-calliope/docs/reference/js/lessons/screen-wipe/challenges.md

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# screen wipe challenges
Coding challenges for the screen wipe tutorial. #docs
## Before we get started
Complete the [screen wipe](/microbit/lessons/screen-wipe) activity and your code will look like this:
```
basic.showAnimation(`
# # # # # # # # # # . . . . . . . . . .
# # # # # # # # # # . . . . . . . . . .
. . . . . # # # # # # # # # # . . . . .
. . . . . # # # # # # # # # # # # # # #
. . . . . . . . . . . . . . . # # # # #
`, 400)
input.onButtonPressed(Button.A, () => {
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basic.clearScreen()
})
```
**Challenge 1**
Create an event handler for Button "B".
```
basic.showAnimation(`
# # # # # # # # # # . . . . . . . . . .
# # # # # # # # # # . . . . . . . . . .
. . . . . # # # # # # # # # # . . . . .
. . . . . # # # # # # # # # # # # # # #
. . . . . . . . . . . . . . . # # # # #
`, 400)
input.onButtonPressed(Button.A, () => {
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basic.clearScreen()
})
input.onButtonPressed(Button.B, () => {
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})
```
**Challenge 2**
### @video td/videos/screen-wipe-2
Replay the animation when the "B" button is pressed by typing in `basic->show animation(..., 400)`.
```
basic.showAnimation(`
# # # # # # # # # # . . . . . . . . . .
# # # # # # # # # # . . . . . . . . . .
. . . . . # # # # # # # # # # . . . . .
. . . . . # # # # # # # # # # # # # # #
. . . . . . . . . . . . . . . # # # # #
`, 400)
input.onButtonPressed(Button.A, () => {
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basic.clearScreen()
})
input.onButtonPressed(Button.B, () => {
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basic.showAnimation(`
# # # # # # # # # # . . . . . . . . . .
# # # # # # # # # # . . . . . . . . . .
. . . . . # # # # # # # # # # . . . . .
. . . . . # # # # # # # # # # # # # # #
. . . . . . . . . . . . . . . # # # # #
`, 400) // ***
})
```
**Challenge 3**
Show an animation that scrolls back up when you press button "B".
* tap the `run` button to view your final product!