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

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# flipping bird challenges
Coding challenges for flipping bird. #docs
## Before we get started
Complete the following guided tutorial:
* [tutorial](/lessons/flipping-bird/tutorial)
At the end of the tutorial, click `keep editing`. Your code should look like this:
```
counter = 0
input.onGesture(Gesture.Shake, () => {
counter = counter + 1
if (math.mod(counter, 2) == 1) {
basic.plotImage(`
# # . # #
. . # . .
. . . . .
. . . . .
. . . . .
`)
}
})
```
### 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) {
basic.plotImage(`
# # . # #
. . # . .
. . . . .
. . . . .
. . . . .
`)
}
if (math.mod(counter, 2) == 0) {
}
})
```
### Challenge 2
### @video td/videos/flipping-bird-2
Inside of that `if` statement you created in challenge 1, add `basic->plot image()` and display an upside down flying bird.
```
counter = 0
input.onGesture(Gesture.Shake, () => {
counter = counter + 1
if (math.mod(counter, 2) == 1) {
basic.plotImage(`
# # . # #
. . # . .
. . . . .
. . . . .
. . . . .
`)
}
if (math.mod(counter, 2) == 0) {
basic.plotImage(`
. . . . .
. . . . .
. . . . .
. . # . .
# # . # #
`) // ***
}
})
```
* `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!