pxt-calliope/docs/reference/js/lessons/looper/quiz-answers.md

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2016-03-26 00:47:20 +01:00
# looper quiz answers
Learn how to create a series of numbers with a for loop. #LED #screen #plot #docs
This is the answer key for the [looper quiz](/microbit/lessons/looper/quiz).
## 1. What is a for loop?
Answers will vary. In general, for loop refers to the code that repeats for a fixed number of times. We specify the LED using x, y coordinates.
## 2. Consider the following code
```
for (let i = 0; i < 4; i++) {
basic.showNumber(i, 150)
}
```
If the rectangle below represents the BBC micro:bit, shade the areas that will be displayed. Explain why that particular area is shaded.
Let's create a for loop where `0` is the loop's starting value, `i` is the index variable, and `4` is the ending value. The index variable `i` starts at 0 and increases by 1 each time through the loop. The loop ends when `i = 4`.
![](/static/mb/lessons/looper-0.png)
## 3. Consider the following code
```
for (let i1 = 0; i1 < 6; i1++) {
basic.showNumber(i1, 150)
}
```
If the rectangle below represents the BBC micro:bit, shade the areas that will be displayed. Explain why that particular area is shaded.
Let's create a for loop where `0` is the loop's starting value, `i` is the index variable, and `6` is the ending value. The index variable `i` starts at 0 and increases by 1 each time through the loop. The loop ends when `i = 6`.
![](/static/mb/lessons/looper-0.png)
![](/static/mb/lessons/looper-1.png)