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

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# jailbreak challenges
Coding challenges for the jailbreak tutorial.#docs
## Before we get started
Complete the following guided tutorial:
* [tutorial](/lessons/jailbreak/tutorial)
At the end of the tutorial, click `keep editing`. Your code should look like this:
```
count = 0
shouldBreak = false
input.onButtonPressed(Button.A, () => {
shouldBreak = true
})
while (true) {
if (shouldBreak) {
basic.showString("I'M OUT!", 150)
basic.plotImage(`
. # . # .
. # . # .
. . . . .
# . . . #
. # # # .
`)
break
}
count = count + 1
basic.showNumber(count, 150)
basic.pause(1000)
}
```
**Challenge 1**
Try to remove the `break` in the `if` loop. What problem does this create?
**Challenge 2**
Now let's resume the timer again once button `B` is pressed! To do so, begin by creating a condition to know when button `B` is pressed.
```
// **. . .**
while (true) {
if (shouldBreak) {
basic.showString("I'M OUT!", 150)
basic.plotImage(`
. # . # .
. # . # .
. . . . .
# . . . #
. # # # .
`)
break
}
count = count + 1
basic.showNumber(count, 150)
basic.pause(1000)
}
input.onButtonPressed(Button.B, () => {
}) // ***
```
Next, set `should break` back to false to indicate we want to run the `while` loop again.
```
// **. . .**
input.onButtonPressed(Button.B, () => {
shouldBreak = false // ***
})
```
And now copy the code from the previous while loop into the condition of `input->on button pressed("B")`. This will resume the counter.
```
// **. . .**
input.onButtonPressed(Button.B, () => {
shouldBreak = false
while (true) {
if (shouldBreak) {
basic.showString("I'M OUT!", 150) // ***
basic.plotImage(`
. # . # .
. # . # .
. . . . .
# . . . #
. # # # .
`) // ***
break // ***
}
count = count + 1 // ***
basic.showNumber(count, 150) // ***
basic.pause(1000) // ***
}
})
```
**Challenge 3**
Notice that the two `while` loops are identical. Clean up this redundancy in your code by creating another method and then placing the `while` loop in the method.