pxt-calliope/docs/lessons/looper/challenges.md

looper block challenges

Coding challenges for the looper.

Before we get started

Complete the following guided activity:

• activity

At the end of the activity, your code should look like this:

for (let i = 0; i < 6; i++) {
    basic.showNumber(i)
    basic.pause(2000)
}

Challenge 1

What if we want to count up to lucky number 7 instead? Let's do that by changing the ending value to 7 instead of 5.

for (let i = 0; i < 8; i++) {
    basic.showNumber(i)
    basic.pause(2000)
}

• Run the program now to see your changes.

Challenge 2

What about 9? Let's do that by changing the ending value to 9.

for (let i = 0; i < 10; i++) {
    basic.showNumber(i)
    basic.pause(2000)
}

• Run your code to see the new counter.

Challenge 3

Now let's start counting from 3 instead! Our for loop will always start at 0 so we simply add 3 to the i variable when passing it to show number.

for (let i = 0; i < 10; i++) {
    basic.showNumber(i+3)
    basic.pause(2000)
}

Run it on the simulator!

Challenge 4

Now, let's count down from 9. Change the line show number(i + 2, 150) to show number(9 - i, 150).

for (let i = 0; i < 10; i++) {
    basic.showNumber(9-i)
    basic.pause(2000)
}

• Run the code to make sure it is doing what is expected.

Challenge 5

After counting down from 9 let's show the string BOOOM!