pxt-calliope/olddocs/js/lessons/on-shake/challenges.md
2016-04-15 14:37:25 -07:00

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# flipping bird challenges
These challenges will allow you to create and display a flipping image of a bird when the micro:bit is shaken. #docs
### Challenge 0
### @video vimeo/134449611
Greetings! This [guided tutorial](/lessons/flipping-bird/tutorial) will begin to show you how to flip a bird.
```
counter = 0
input.onGesture(Gesture.Shake, () => {
counter = counter + 1
if (math.mod(counter, 2) == 1) {
images.createImage(`
# # . # #
. . # . .
. . . . .
. . . . .
. . . . .
`).showImage(0)
}
})
```
### Challenge 1
We handled the case of when `math->mod(counter,2) = 1`. We haven't done anything when the remainder is 0! Add an if statement to handle this case.
```
counter = 0
input.onGesture(Gesture.Shake, () => {
counter = counter + 1
if (math.mod(counter, 2) == 1) {
images.createImage(`
# # . # #
. . # . .
. . . . .
. . . . .
. . . . .
`).showImage(0)
}
if (math.mod(counter, 2) == 0) {
}
})
```
### Challenge 2
Inside of that `if` statement you created in challenge 1, add `image->create image()->show image(0)` and display an upside down flying bird.
```
counter = 0
input.onGesture(Gesture.Shake, () => {
counter = counter + 1
if (math.mod(counter, 2) == 1) {
images.createImage(`
# # . # #
. . # . .
. . . . .
. . . . .
. . . . .
`).showImage(0)
}
if (math.mod(counter, 2) == 0) {
images.createImage(`
. . . . .
. . . . .
. . . . .
. . # . .
# # . # #
`).showImage(0) // ***
}
})
```
* Run the code to see if it works as expected.
### Challenge 3
Display a check mark and question mark instead of flipping birds. Or better yet, come up with your own pair of opposites to display!