84 lines
1.6 KiB
Markdown
84 lines
1.6 KiB
Markdown
# looper challenges
|
|
|
|
Coding challenges for the looper tutorial. #docs
|
|
|
|
## Before we get started
|
|
|
|
Complete the following guided tutorial:
|
|
|
|
* [tutorial](/lessons/looper/tutorial)
|
|
|
|
At the end of the tutorial, click `keep editing`. Your code should look like this:
|
|
|
|
```
|
|
for (let i = 0; i < 6; i++) {
|
|
basic.showNumber(i, 150)
|
|
basic.pause(2000)
|
|
}
|
|
```
|
|
|
|
### Challenge 1
|
|
|
|
### @video td/videos/looper-1
|
|
|
|
What if we want to count up to lucky number 7 instead? Let's do that by changing the ending value to `8` instead of `6`.
|
|
|
|
```
|
|
for (let i1 = 0; i1 < 8; i1++) {
|
|
basic.showNumber(i1, 150) // ***
|
|
basic.pause(2000)
|
|
}
|
|
```
|
|
|
|
* Run the program now to see your changes.
|
|
|
|
### Challenge 2
|
|
|
|
### @video td/videos/looper-2
|
|
|
|
What about 9? Let's do that by changing the ending value to `10`.
|
|
|
|
```
|
|
for (let i2 = 0; i2 < 10; i2++) {
|
|
basic.showNumber(i2, 150)
|
|
basic.pause(2000)
|
|
}
|
|
```
|
|
|
|
* Run your code to see the new counter.
|
|
|
|
### Challenge 3
|
|
|
|
### @video td/videos/looper-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 `basic->show number`.
|
|
|
|
```
|
|
for (let i3 = 0; i3 < 8; i3++) {
|
|
basic.showNumber(i3 + 3, 150) // ***
|
|
basic.pause(2000)
|
|
}
|
|
```
|
|
|
|
Run it on the simulator!
|
|
|
|
### Challenge 4
|
|
|
|
### @video td/videos/looper-4
|
|
|
|
Now, let's **count down from 9**. Change the line `basic->show number(i + 3, 150)` to `basic->show number(9 - i, 150)`.
|
|
|
|
```
|
|
for (let i4 = 0; i4 < 10; i4++) {
|
|
basic.showNumber(9 - i4, 150) // ***
|
|
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`!
|
|
|