pxt-calliope/docs/reference/js/lessons/flashing-heart/challenges.md

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2016-03-26 00:47:20 +01:00
# flashing heart challenges
Coding challenges for flashing heart.
## Before we get started
Complete the [flashing heart](/microbit/lessons/flashing-heart/activity) activity and your code will look like this:
```
basic.forever(() => {
basic.plotImage(`
. # . # .
# # # # #
# # # # #
. # # # .
. . # . .
`)
basic.pause(500)
basic.clearScreen()
basic.pause(500)
})
```
### Challenge 1
### @video td/videos/flashing-heart-1
Let's plot a different image. Let's display a broken heart!
To do this, you need to **add a line** between the last line and the end loop. Plot the image of the broken heart and then add a pause of 500 milliseconds.
```
basic.forever(() => {
basic.plotImage(`
# # . # #
# # # # #
# # # # #
. # # # .
. . # . .
`)
basic.pause(500)
basic.clearScreen()
basic.pause(500)
basic.plotImage(`
. # . # .
# . # # #
# . . # #
. # # # .
. . # . .
`) // ***
basic.pause(500) // ***
})
```
* click `run main` to see if the code works as expected.
### Challenge 2
### @video td/videos/flashing-heart-2
Now let's alternate flashing the heart and the broken heart. To do this, we need to clear the screen and then add a pause of 500 milliseconds under the new code we added in Challenge 1.
```
basic.forever(() => {
basic.plotImage(`
# # . # #
# # # # #
# # # # #
. # # # .
. . # . .
`)
basic.pause(500)
basic.clearScreen()
basic.pause(500)
basic.plotImage(`
. # . # .
# . # # #
# . . # #
. # # # .
. . # . .
`)
basic.pause(500)
basic.clearScreen() // ***
basic.pause(500) // ***
})
```
* click `run main` to see if the code works as expected.
### Challenge 3
You now have a heart and broken heart flashing! Now plot a new image to alternate in with the heart and broken heart.