pxt-calliope/docs/reference/js/lessons/counter/activity.md
2016-03-25 16:47:20 -07:00

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counter activity

Display a number with a variable.

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@video td/videos/counter-0

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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To create a new script, go to the Create Code page and tap New Project under Touch Develop.

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("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_1 = 0
input.onButtonPressed("A", () => {
    count = count + 1
    basic.showNumber(count, 150)
})

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Excellent, you're ready to continue with the challenges!

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