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docs/lessons/counter/challenges.md
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# counter challenges
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Coding challenges for the counter.
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## Before we get started
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Complete the following [guided tutorial](/microbit/lessons/counter/activity) At the end of the tutorial, click **keep editing**. Your code should look like this:
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```blocks
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let count = 0
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input.onButtonPressed(Button.A, () => {
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count = count + 1
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basic.showNumber(count)
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})
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```
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### Challenge 1
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### @video td/videos/counter-1-2
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Let's add the code to `count` when `B` is pressed. Add an event handler with `on button pressed(B)` then add the code to `count`.
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```blocks
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let count = 0
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input.onButtonPressed(Button.A, () => {
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count = count + 1
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basic.showNumber(count)
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})
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input.onButtonPressed(Button.B, () => {
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count = count - 1
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basic.showNumber(count)
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})
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```
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### Challenge 3
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Now let's try to reset the counter when the micro:bit is shaken. You will need to register an event handler with `on shake`.
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