pxt-calliope/docs/reference/js/lessons/magic-8-ball/challenges.md

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2016-03-26 00:47:20 +01:00
# magic 8 challenges
Coding challenges for the magic 8 tutorial #docs
## Before we get started
Complete the following guided tutorial:
* [tutorial](/microbit/lessons/magic-8-ball/tutorial)
At the end of the tutorial, click `keep editing`. Your code should look like this:
```
basic.showString("Ask a question", 150)
basic.showNumber(8, 150)
input.onGesture(Gesture.Shake, () => {
basic.clearScreen()
let randomNumber = Math.random(3)
if (randomNumber == 2) {
basic.showString("Yes", 150)
} else if (randomNumber == 1) {
basic.showString("No", 150)
}
else {
basic.showString("I don't know", 150)
}
basic.showNumber(8, 150)
})
```
**Challenge 1**
Now let's increase the number of responses the magic 8 ball can give. How about 5 responses instead? Let's change the limit of `math->random` to 5.
```
basic.showString("Ask a question", 150)
basic.showNumber(8, 150)
input.onGesture(Gesture.Shake, () => {
basic.clearScreen()
let randomNumber1 = Math.random(5) // ***
if (randomNumber1 == 2) {
basic.showString("Yes", 150)
} else if (randomNumber1 == 1) {
basic.showString("No", 150)
}
else {
basic.showString("I don't know", 150)
}
basic.showNumber(8, 150)
})
```
**Challenge 2**
Now have the magic 8 ball respond "Try again" if **randomNumber** is 3.
```
basic.showString("Ask a question", 150)
basic.showNumber(8, 150)
input.onGesture(Gesture.Shake, () => {
basic.clearScreen()
let randomNumber2 = Math.random(5)
if (randomNumber2 == 3) {
basic.showString("Try again", 150) // ***
} else if (randomNumber2 == 2) {
basic.showString("Yes", 150)
}
else if (randomNumber2 == 1) {
basic.showString("No", 150)
}
else {
basic.showString("I don't know", 150)
}
basic.showNumber(8, 150)
})
```
**Challenge 3**
Now what about if **randomNumber** is 4? Let's have the magic 8 ball respond "Definitely!".
```
basic.showString("Ask a question", 150)
basic.showNumber(8, 150)
input.onGesture(Gesture.Shake, () => {
basic.clearScreen()
let randomNumber3 = Math.random(5)
if (randomNumber3 == 4) {
basic.showString("Definitely!", 150) // ***
} else if (randomNumber3 == 3) {
basic.showString("Try again", 150)
}
else if (randomNumber3 == 2) {
basic.showString("Yes", 150)
}
else if (randomNumber3 == 1) {
basic.showString("No", 150)
}
else {
basic.showString("I don't know", 150)
}
basic.showNumber(8, 150)
})
```
**Challenge 4**
Add 3 more responses so your magic 8 ball has 8 possible responses. Be creative!