pxt-calliope/docs/reference/js/lessons/on-shake/challenges.md

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 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!