2019-11-05 03:09:40 +00:00
|
|
|
---
|
|
|
|
|
id: 5d7925329445167ecc2ac9c9
|
2020-08-25 09:19:45 +00:00
|
|
|
title: Part 4
|
2019-11-05 03:09:40 +00:00
|
|
|
challengeType: 0
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
## Description
|
|
|
|
|
<section id='description'>
|
|
|
|
|
|
2019-12-09 10:37:02 +00:00
|
|
|
In JavaScript, functions are first class. This means that they can be used like any other values - for example, they can be assigned to variables.
|
|
|
|
|
|
2019-11-05 03:09:40 +00:00
|
|
|
Assign `add` to a new variable `addVar`.
|
|
|
|
|
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
## Instructions
|
|
|
|
|
<section id='instructions'>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
## Tests
|
|
|
|
|
<section id='tests'>
|
|
|
|
|
|
|
|
|
|
```yml
|
|
|
|
|
tests:
|
|
|
|
|
- text: See description above for instructions.
|
|
|
|
|
testString: assert(code.replace(/\s/g, "").includes("constaddVar=add"));
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
## Challenge Seed
|
|
|
|
|
<section id='challengeSeed'>
|
|
|
|
|
|
|
|
|
|
<div id='html-seed'>
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
<script>
|
|
|
|
|
|
|
|
|
|
function add(x, y) {
|
|
|
|
|
return x + y;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
const infixToFunction = {};
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</script>
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Before Test
|
|
|
|
|
<div id='html-setup'>
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
<!DOCTYPE html>
|
|
|
|
|
<html lang="en">
|
|
|
|
|
<head>
|
|
|
|
|
<meta charset="UTF-8">
|
|
|
|
|
<title>Spreadsheet</title>
|
|
|
|
|
<style>
|
|
|
|
|
#container {
|
|
|
|
|
display: grid;
|
|
|
|
|
grid-template-columns: 50px repeat(10, 200px);
|
|
|
|
|
grid-template-rows: repeat(11, 30px);
|
|
|
|
|
}
|
|
|
|
|
.label {
|
|
|
|
|
background-color: lightgray;
|
|
|
|
|
text-align: center;
|
|
|
|
|
vertical-align: middle;
|
|
|
|
|
line-height: 30px;
|
|
|
|
|
}
|
|
|
|
|
</style>
|
|
|
|
|
</head>
|
|
|
|
|
<body>
|
|
|
|
|
<div id="container">
|
|
|
|
|
<div></div>
|
|
|
|
|
</div>
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### After Test
|
|
|
|
|
<div id='html-teardown'>
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
## Solution
|
|
|
|
|
<section id='solution'>
|
|
|
|
|
|
|
|
|
|
```html
|
|
|
|
|
<script>
|
|
|
|
|
function add(x, y) {
|
|
|
|
|
return x + y;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
const addVar = add;
|
|
|
|
|
|
|
|
|
|
const infixToFunction = {};
|
|
|
|
|
</script>
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
</section>
|
