pxt-calliope/docs/lessons/counter/activity.md

counter activity

Display a number with a variable.

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Welcome! This tutorial will teach you how to make a counter that increments when button A is pressed. Let's get started!

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Let's start by creating a local variable count to keep track of the current count.

let count = 0

The code under on button pressed("A") will run each time the user presses A. Let's add a line of code that increments count by 1.

let count = 0
input.onButtonPressed(Button.A, () => {
    count = count + 1
})

Since the count has changed, it's time to refresh the screen display. Let's add a line of code to display the count on screen.

let count = 0
input.onButtonPressed(Button.A, () => {
    count = count + 1
    basic.showNumber(count)
})

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Excellent, you're ready to continue with the challenges

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