pxt-calliope/olddocs/lessons/looper/challenges.md
Tom Ball f4eca66648 move lessons out of web site
will move select lessons back to "educators" section
2016-06-14 11:49:58 -04:00

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looper block challenges

Coding challenges for the looper.

Before we get started

Complete the following guided 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!