pxt-calliope/olddocs/lessons/headbands/quiz-answers.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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# headbands quiz answers
create a charades game with a collection of strings.
## Name
## Directions
Use this activity document to guide your work in the [headbands tutorial](/lessons/headbands/activity).
Answer the questions while completing the tutorial. Pay attention to the dialogues!
## 1. What is the meaning of the term 'collection' in programming? What is a 'collection' of strings?
<br/>
A 'collection' is a group of variables of the same type stored together. A 'collection' of strings is a group of strings stored together.
## 2. Consider the following lines of code.
```blocks
let coll = (<string[]>[])
coll.push("puppy")
coll.push("clock")
```
Write the line of code that will display the string "puppy" using `data->coll`.
<br/>
```blocks
basic.showString(coll[0], 150)
```
## 3. Consider the following lines of code.
```blocks
let coll = (<string[]>[])
coll.push("puppy")
coll.push("clock")
coll.push("cat")
```
Write the line of code that will display the string "cat" using `data->coll`.
<br/>
```blocks
basic.showString(coll[2], 150)
```
## 4. Consider the following line of code.
```blocks
let coll = (<string[]>[])
```
Write the five (5) lines of code that will add the following five words to `data->coll`: puppy, clock, night, cat, cow.
<br/>
```blocks
let coll.push("puppy")
coll.push("clock")
coll.push("night")
coll.push("cat")
coll.push("cow")
```
## 5. Write the code to get a string from the collection at a random position.
<br/>
```blocks
let index = Math.random(coll.length)
let word = coll[index]
```