pxt-calliope/olddocs/js/lessons/button/challenges.md

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# button challenges
My script. #docs
### Challenge 0
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Howdy! This [guided tutorial](/rxqgzy) will help you complete this activity!
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In this guide, you will learn how to use buttons and show text on the screen. Let's start by adding to respond **when the left button is pressed**.
```
input.onButtonPressed(Button.A, () => {
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})
```
All the code inside `input->on button pressed` runs when the button is pressed. Let's add the code to show some text.
```
input.onButtonPressed(Button.A, () => {
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basic.showString("hello", 150)
})
```
### Challenge 1
Let's add an event handler for Button `B`.
```
input.onButtonPressed(Button.A, () => {
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basic.showString("hello", 150)
})
input.onButtonPressed(Button.B, () => {
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})
```
### Challenge 2
Display `bye` when the `B` button is pressed.
```
input.onButtonPressed(Button.A, () => {
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basic.showString("hello", 150)
})
input.onButtonPressed(Button.B, () => {
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basic.showString("bye", 150)
})
```
### Challenge 3
Change the strings so that they display some other text. In order to do so, you will need to edit what is inside the quotation marks in `basic->show string`.