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docs/lessons/rock-paper-scissors/activity.md Normal file
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# rock paper scissors activity
A classic game against the micro:bit.
### ~avatar avatar
### @video td/videos/rock-paper-scissors-0
Welcome! This tutorial will help you create a game of rock paper scissors with the micro:bit. Let's get started!
### ~
To create a new script, go to the [Create Code](/microbit/create-code) page and tap *New Project* under **Touch Develop**.
We want the micro:bit to choose rock, paper, or scissors when it is shaken. Let's begin by creating an on shake condition so the micro:bit will run code when it is shaken.
```blocks
input.onGesture(Gesture.Shake, () => {
})
```
Next, create a variable and store pick random number from 0 to 2. On shake, a number will be randomly picked from 0-2. We will randomly display an image based on the random number returned.
```blocks
input.onGesture(Gesture.Shake, () => {
let img = Math.random(3)
})
```
The micro:bit will look like it's showing 1 frame of the image by displaying the whole image when pick random is equal to 2. We can help the micro:bit randomly decide which image to use by pick random. The micro:bit will randomly pick the image to display with show LEDs and the pick random function.
```blocks
input.onGesture(Gesture.Shake, () => {
let img = Math.random(3)
if (img == 2) {
basic.showLeds(`
# # # # #
# . . . #
# . . . #
# . . . #
# # # # #
`)
}
})
```
The micro:bit will look like it's showing 1 frame of the image by displaying the whole image when pick random is equal to 1. We can help the micro:bit randomly decide which image to use by pick random. The micro:bit will randomly pick the image to display with show LEDs and the pick random function.
```blocks
input.onGesture(Gesture.Shake, () => {
let img = Math.random(3)
if (img == 2) {
basic.showLeds(`
# # # # #
# . . . #
# . . . #
# . . . #
# # # # #
`)
} else if (img == 1) {
basic.showLeds(`
. . . . .
. # # # .
. # # # .
. # # # .
. . . . .
`)
}
})
```
The micro:bit will look like it's showing 1 frame of the image by displaying the whole image when pick random is not equal to 2 and not equal to 1. We can help the micro:bit randomly decide which image to use by pick random. The micro:bit will randomly pick the image to display with show LEDs and the pick random function.
```blocks
input.onGesture(Gesture.Shake, () => {
let img = Math.random(3)
if (img == 2) {
basic.showLeds(`
# # # # #
# . . . #
# . . . #
# . . . #
# # # # #
`)
} else if (img == 1) {
basic.showLeds(`
. . . . .
. # # # .
. # # # .
. # # # .
. . . . .
`)
} else {
basic.showLeds(`
. . . # #
# # . # .
. . # . .
# # . # .
. . . # #
`)
}
})
```
### ~avatar avatar
Excellent, you're ready to continue with the [challenges](/microbit/lessons/rock-paper-scissors/challenges)!
### ~

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# rock paper scissors challenges
Coding challenges for rock paper scissors.
## Before we get started
Complete the following [guided activity](/microbit/lessons/rock-paper-scissors/activity) , your code should look like this:
```blocks
input.onGesture(Gesture.Shake, () => {
let img = Math.random(3)
if (img == 2) {
basic.showLeds(`
# # # # #
# . . . #
# . . . #
# . . . #
# # # # #
`)
} else if (img == 1) {
basic.showLeds(`
. . . . .
. # # # .
. # # # .
. # # # .
. . . . .
`)
} else {
basic.showLeds(`
. . . # #
# # . # .
. . # . .
# # . # .
. . . # #
`)
}
})
```
### Challenge 1
When the A button is pressed, increment the score by 1. You can select Game drawer then add change score by 1.
```blocks
input.onGesture(Gesture.Shake, () => {
let img = Math.random(2)
if (img == 2) {
basic.showLeds(`
# # # # #
# . . . #
# . . . #
# . . . #
# # # # #
`)
} else if (img == 1) {
basic.showLeds(`
. . . . .
. # # # .
. # # # .
. # # # .
. . . . .
`)
} else {
basic.showLeds(`
. . . # #
# # . # .
. . # . .
# # . # .
. . . # #
`)
}
})
input.onButtonPressed(Button.A, () => {
game.addScore(1)
})
```
* Click *run* to execute your code in the simulator
### Challenge 2
After incrementing the score, display the total number of wins you have.
```blocks
input.onGesture(Gesture.Shake, () => {
let img = Math.random(2)
if (img == 2) {
basic.showLeds(`
# # # # #
# . . . #
# . . . #
# . . . #
# # # # #
`)
} else if (img == 1) {
basic.showLeds(`
. . . . .
. # # # .
. # # # .
. # # # .
. . . . .
`)
} else {
basic.showLeds(`
. . . # #
# # . # .
. . # . .
# # . # .
. . . # #
`)
}
})
input.onButtonPressed(Button.A, () => {
game.addScore(1)
basic.showString("WINS:")
basic.showNumber(game.score())
})
```
* Run and compile the code to see if it works as expected.
### Challenge 3
You have successfully tracked and displayed the number of wins on the micro:bit! However, what about losses? Use the Game drawer to change score by -1 when button `B` is pressed.
* Run and compile the code to see if it works as expected.