pxt-calliope/docs/reference/js/lessons/transformers/challenges.md

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# transformers challenges
Coding challenges for the transformers tutorial. #docs
## Before we get started
Complete the following guided tutorial:
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* [tutorial](/lessons/transformers/tutorial)
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At the end of the tutorial, click `keep editing`. Your code should look like this:
```
let inital = 5
input.onButtonPressed(Button.A, () => {
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let doubled1 = double(initial)
basic.showNumber(doubled1, 150) // ***
})
```
### Challenge 1
Create a new function called `square` that returns the square of the number passed into the function.
(Squaring means that you multiply the number by itself)
```
export function square(n: number) : number {
let num: number
return n * n
return num
}
```
### Challenge 2
### @video td/videos/transformers-2
Add a condition for when button `B` is pressed. We will use this condition in the last challenge.
```
initial = 5
input.onButtonPressed(Button.A, () => {
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let doubled = double(initial)
basic.showNumber(doubled, 150)
})
input.onButtonPressed(Button.B, () => {
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}) // ***
```
**Challenge 3**
When the `B` button is pressed, display the square of the initial value. Use the function `square`. You should get the value 25.