move lessons out of web site
will move select lessons back to "educators" section
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Tom Ball
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# looper blocks activity
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Welcome! This activity will teach how to display a series of numbers for a for loop. Let's get started!
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Let's create a for loop where `0` is the loop's starting value, `i` is the index variable, and `5` 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 = 5`.
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```blocks
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for (let i = 0; i < 6; i++) {
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}
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```
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We will show the number of times the loop has been executed. It will go from zero to five times.
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```blocks
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for (let i = 0; i < 6; i++) {
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basic.showNumber(i)
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}
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```
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The for loop while cycle through to six immediately unless we pause for a little bit in between each loop.
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```blocks
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for (let i = 0; i < 6; i++) {
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basic.showNumber(i)
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basic.pause(2000)
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}
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```
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### ~avatar avatar
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Excellent, you're ready to continue with the [challenges](/lessons/looper/challenges)!
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### ~
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# looper block challenges
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Coding challenges for the looper.
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## Before we get started
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Complete the following guided activity:
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* [activity](/lessons/looper/activity)
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At the end of the activity, your code should look like this:
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```blocks
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for (let i = 0; i < 6; i++) {
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basic.showNumber(i)
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basic.pause(2000)
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}
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```
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### Challenge 1
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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`.
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```blocks
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for (let i = 0; i < 8; i++) {
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basic.showNumber(i)
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basic.pause(2000)
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}
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```
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* Run the program now to see your changes.
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### Challenge 2
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What about 9? Let's do that by changing the ending value to `9`.
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```blocks
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for (let i = 0; i < 10; i++) {
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basic.showNumber(i)
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basic.pause(2000)
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}
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```
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* Run your code to see the new counter.
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### Challenge 3
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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`.
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```blocks
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for (let i = 0; i < 10; i++) {
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basic.showNumber(i+3)
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basic.pause(2000)
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}
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```
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Run it on the simulator!
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### Challenge 4
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Now, let's **count down from 9**. Change the line `show number(i + 2, 150)` to `show number(9 - i, 150)`.
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```blocks
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for (let i = 0; i < 10; i++) {
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basic.showNumber(9-i)
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basic.pause(2000)
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}
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```
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* Run the code to make sure it is doing what is expected.
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### Challenge 5
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After counting down from `9` let's show the string `BOOOM`!
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# looper quiz answers
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Learn how to create a series of numbers with a for loop.
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This is the answer key for the [looper quiz](/lessons/looper/quiz).
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## 1. What is a for loop?
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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.
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## 2. Consider the following code
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```blocks
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for (let i = 0; i < 4; i++) {
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basic.showNumber(i, 150)
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}
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```
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If the rectangle below represents the BBC micro:bit, shade the areas that will be displayed. Explain why that particular area is shaded.
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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`.
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## 3. Consider the following code
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```blocks
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for (let i1 = 0; i1 < 6; i1++) {
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basic.showNumber(i1, 150)
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}
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```
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If the rectangle below represents the BBC micro:bit, shade the areas that will be displayed. Explain why that particular area is shaded.
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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`.
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# looper quiz
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Learn how to create a series of numbers with a for loop.
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## Name
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## Directions
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Use this activity document to guide your work in the [looper tutorial](/lessons/looper/activity)
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Answer the questions while completing the tutorial. Pay attention to the dialogues!
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## 1. Describe what a "for loop" does?
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<br/>
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## 2. Draw the areas where the LEDs will be lit based on the code below. Explain why you chose to draw those numbers.
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```blocks
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for (let i = 0; i < 4; i++) {
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basic.showNumber(i, 150)
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}
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```
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<br/>
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## 3. Draw the areas where the LEDs will be lit based on the code below. Explain why you chose to draw those numbers.
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```blocks
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for (let i1 = 0; i1 < 6; i1++) {
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basic.showNumber(i1, 150)
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}
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```
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<br/>
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