mirror of
https://github.com/freeCodeCamp/freeCodeCamp.git
synced 2025-12-22 19:43:28 -05:00
111 lines
3.3 KiB
Markdown
111 lines
3.3 KiB
Markdown
---
|
|
id: 64345b810a6e481e5e326849
|
|
title: Step 12
|
|
challengeType: 0
|
|
dashedName: step-12
|
|
---
|
|
|
|
# --description--
|
|
|
|
`range()` will return an array of numbers, which you need to convert back into characters. Chain the `.map()` method to your `range()` call.
|
|
|
|
Pass a callback function that takes `code` as the parameter and implicitly returns the value of passing `code` to the `String.fromCharCode()` method.
|
|
|
|
# --hints--
|
|
|
|
You should use the `.map()` method.
|
|
|
|
```js
|
|
assert.lengthOf(code.match(/\.map\(/g), 2);
|
|
```
|
|
|
|
You should chain the `.map()` method to your `range` call.
|
|
|
|
```js
|
|
assert.match(code, /const\s+charRange\s*=\s*\(\s*start\s*,\s*end\s*\)\s*=>\s*range\(\s*start\.charCodeAt\(\s*0\s*\)\s*,\s*end\.charCodeAt\(\s*0\s*\)\s*\)\.map\(/);
|
|
```
|
|
|
|
You should use arrow syntax for the `.map()` callback.
|
|
|
|
```js
|
|
assert.match(code, /const\s+charRange\s*=\s*\(\s*start\s*,\s*end\s*\)\s*=>\s*range\(\s*start\.charCodeAt\(\s*0\s*\)\s*,\s*end\.charCodeAt\(\s*0\s*\)\s*\)\.map\(\s*(\(.*\)|[^\s()]+)\s*=>/);
|
|
```
|
|
|
|
Your `.map()` callback should take a `code` parameter.
|
|
|
|
```js
|
|
assert.match(code, /const\s+charRange\s*=\s*\(\s*start\s*,\s*end\s*\)\s*=>\s*range\(\s*start\.charCodeAt\(\s*0\s*\)\s*,\s*end\.charCodeAt\(\s*0\s*\)\s*\)\.map\(\s*(\(\s*code\s*\)|code)\s*=>/);
|
|
```
|
|
|
|
Your `.map()` callback should use an implicit return.
|
|
|
|
```js
|
|
assert.notMatch(code, /const\s+charRange\s*=\s*\(\s*start\s*,\s*end\s*\)\s*=>\s*range\(\s*start\.charCodeAt\(\s*0\s*\)\s*,\s*end\.charCodeAt\(\s*0\s*\)\s*\)\.map\(\s*(\(\s*code\s*\)|code)\s*=>\s*\{/);
|
|
```
|
|
|
|
Your `.map()` callback should return the result of calling `String.fromCharCode()`.
|
|
|
|
```js
|
|
assert.match(code, /const\s+charRange\s*=\s*\(\s*start\s*,\s*end\s*\)\s*=>\s*range\(\s*start\.charCodeAt\(\s*0\s*\)\s*,\s*end\.charCodeAt\(\s*0\s*\)\s*\)\.map\(\s*(\(\s*code\s*\)|code)\s*=>\s*String\.fromCharCode\(/);
|
|
```
|
|
|
|
You should pass the variable `code` to `String.fromCharCode()`.
|
|
|
|
```js
|
|
assert.match(code, /const\s+charRange\s*=\s*\(\s*start\s*,\s*end\s*\)\s*=>\s*range\(\s*start\.charCodeAt\(\s*0\s*\)\s*,\s*end\.charCodeAt\(\s*0\s*\)\s*\)\.map\(\s*(\(\s*code\s*\)|code)\s*=>\s*String\.fromCharCode\(\s*code\s*\)/);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```html
|
|
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="utf-8" />
|
|
<meta name="viewport" content="width=device-width, initial-scale=1" />
|
|
<link rel="stylesheet" href="./styles.css" />
|
|
<title>Functional Programming Spreadsheet</title>
|
|
</head>
|
|
<body>
|
|
<div id="container">
|
|
<div></div>
|
|
</div>
|
|
<script src="./script.js"></script>
|
|
</body>
|
|
</html>
|
|
```
|
|
|
|
```css
|
|
#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;
|
|
}
|
|
```
|
|
|
|
```js
|
|
const range = (start, end) => Array(end - start + 1).fill(start).map((element, index) => element + index);
|
|
--fcc-editable-region--
|
|
const charRange = (start, end) => range(start.charCodeAt(0), end.charCodeAt(0));
|
|
--fcc-editable-region--
|
|
|
|
window.onload = () => {
|
|
const container = document.getElementById("container");
|
|
const createLabel = (name) => {
|
|
const label = document.createElement("div");
|
|
label.className = "label";
|
|
label.textContent = name;
|
|
container.appendChild(label);
|
|
}
|
|
}
|
|
```
|