feat(curriculum): add async/await to workshop-fcc-authors-page (#66972)

Signed-off-by: Naomi Carrigan <naomi@freecodecamp.org>
Co-authored-by: Naomi Carrigan <naomi@freecodecamp.org>
This commit is contained in:
hbar1st
2026-05-25 03:47:01 -04:00
committed by GitHub
parent de8655d528
commit fdab641dd0
7 changed files with 1235 additions and 245 deletions
@@ -11,8 +11,6 @@ One more thing. If you keep clicking the `Load More Authors` button until there'
Access the `style` property of the `Load More Authors` button and set `cursor` to `"not-allowed"`.
With that, your author page is complete!
# --before-all--
```js
@@ -189,150 +187,3 @@ const displayAuthors = (authors) => {
loadMoreBtn.addEventListener('click', fetchMoreAuthors);
```
# --solutions--
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>freeCodeCamp News Author Page</title>
<link rel="stylesheet" href="./styles.css" />
</head>
<body>
<h1 class="title">freeCodeCamp News Author Page</h1>
<main>
<div id="author-container"></div>
<button class="btn" id="load-more-btn">Load More Authors</button>
</main>
<script src="./script.js"></script>
</body>
</html>
```
```css
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
:root {
--main-bg-color: #1b1b32;
--light-grey: #f5f6f7;
--dark-purple: #5a01a7;
--golden-yellow: #feac32;
}
body {
background-color: var(--main-bg-color);
text-align: center;
}
.title {
color: var(--light-grey);
margin: 20px 0;
}
#author-container {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.user-card {
border-radius: 15px;
width: 300px;
height: 350px;
background-color: var(--light-grey);
margin: 20px;
}
.user-img {
width: 150px;
height: 150px;
object-fit: cover;
}
.purple-divider {
background-color: var(--dark-purple);
width: 100%;
height: 15px;
}
.author-name {
margin: 10px;
}
.bio {
margin: 20px;
}
.error-msg {
color: var(--light-grey);
}
.btn {
cursor: pointer;
width: 200px;
margin: 10px;
color: var(--main-bg-color);
font-size: 14px;
background-color: var(--golden-yellow);
background-image: linear-gradient(#fecc4c, #ffac33);
border-color: var(--golden-yellow);
border-width: 3px;
}
```
```js
const authorContainer = document.getElementById('author-container');
const loadMoreBtn = document.getElementById('load-more-btn');
let startingIndex = 0;
let endingIndex = 8;
let authorDataArr = [];
fetch('https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json')
.then((res) => res.json())
.then((data) => {
authorDataArr = data;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
})
.catch((err) => {
authorContainer.innerHTML = '<p class="error-msg">There was an error loading the authors</p>';
});
const fetchMoreAuthors = () => {
startingIndex += 8;
endingIndex += 8;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
if (authorDataArr.length <= endingIndex) {
loadMoreBtn.disabled = true;
loadMoreBtn.style.cursor = "not-allowed"
loadMoreBtn.textContent = 'No more data to load';
}
};
const displayAuthors = (authors) => {
authors.forEach(({ author, image, url, bio }, index) => {
authorContainer.innerHTML += `
<div id="${index}" class="user-card">
<h2 class="author-name">${author}</h2>
<img class="user-img" src="${image}" alt="${author} avatar" />
<div class="purple-divider"></div>
<p class="bio">${bio.length > 50 ? bio.slice(0, 50) + '...' : bio}</p>
<a class="author-link" href="${url}" target="_blank">${author} author page</a>
</div>
`;
});
};
loadMoreBtn.addEventListener('click', fetchMoreAuthors);
```
@@ -0,0 +1,239 @@
---
id: 69df434b56d2e0faf1a7424c
title: Step 25
challengeType: 0
dashedName: step-25
---
# --description--
Now that your fCC Authors Page is fully functional, let's refactor it to improve its readability by using `async` and `await` instead of the promise chaining method `then`.
Recall that in order to use the `await` operator to wait for a function that returns a `Promise`, you need to wrap the function call in an `async` function (if it is not in the main body of a module).
Since your `fetch` call is not defined in either an asynchronous function nor in the main body of a module, you cannot use `await` before fixing that.
Wrap the `fetch` statement and the entire sequence of chained then and catch methods as a whole in a new asynchronous arrow function called `initialFetch` which takes no arguments.
An example of an `async` function declaration is:
```js
const functionName = async () => {}
```
# --before-all--
```js
window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
```
# --hints--
`initialFetch` should be a function.
```js
assert.isFunction(initialFetch)
```
You should use `const` to create an `initialFetch` function.
```js
assert.match(code, /const\s+initialFetch\s*=\s*/)
```
`initialFetch` should be an async function.
```js
assert.isFunction(initialFetch)
assert.match(code, /const\s+initialFetch\s*=\s*async\s*/)
```
Your `initialFetch` function should not take any parameter.
```js
assert.match(code, /const\s+initialFetch\s*=\s*.*\s*\(\s*\)\s*/)
```
Your `initialFetch` function should use arrow syntax.
```js
assert.match(code, /const\s+initialFetch\s*=\s*.*\s*\(.*\)\s*=>\s*/)
```
Your `initialFetch` function should not be empty.
```js
assert.isFunction(initialFetch)
assert.notMatch(code, /const\s+initialFetch\s*=\s*.*\s*\(\s*\)\s*=>\s*\{\s*\}/)
```
Your `initialFetch` function should contain the `fetch` statement and the chained methods.
```js
const initialFetchBlockRegex =
/const\s+initialFetch\s*=\s*async\s*\(\s*\)\s*=>\s*\{([\s\S]*?)\}\s*$/m;
const match = code.match(initialFetchBlockRegex);
assert.isDefined(match);
const initialFetchBlockContents = match[1].trim();
const fetchStatementRegex = /^fetch\(\s*(['"`])https:\/\/cdn\.freecodecamp\.org\/curriculum\/news-author-page\/authors\.json\1\s*\)\s*\.then\(\s*(?:\(\s*res\s*\)|res)\s*=>\s*res\.json\(\s*\)\s*\)\s*\.then\(\s*(?:\(\s*data\s*\)|data)\s*=>\s*\{\s*authorDataArr\s*=\s*data;?\s*displayAuthors\(\s*authorDataArr\.slice\(\s*startingIndex\s*,\s*endingIndex\s*\)\s*\)\s*;?\s*\}\s*\)\s*\.catch\(\s*(?:\(\s*err\s*\)|err)\s*=>\s*\{?\s*authorContainer\.innerHTML\s*=\s*(['"`])<p\s+class\s*=\s*(['"`])error-msg\3>\s*There\s+was\s+an\s+error\s+loading\s+the\s+authors\s*<\/p>\s*\2\s*;?\s*\}?\s*\)\s*;?/;
assert.isTrue(fetchStatementRegex.test(initialFetchBlockContents));
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>freeCodeCamp News Author Page</title>
<link rel="stylesheet" href="./styles.css" />
</head>
<body>
<h1 class="title">freeCodeCamp News Author Page</h1>
<main>
<div id="author-container"></div>
<button class="btn" id="load-more-btn">Load More Authors</button>
</main>
<script src="./script.js"></script>
</body>
</html>
```
```css
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
:root {
--main-bg-color: #1b1b32;
--light-grey: #f5f6f7;
--dark-purple: #5a01a7;
--golden-yellow: #feac32;
}
body {
background-color: var(--main-bg-color);
text-align: center;
}
.title {
color: var(--light-grey);
margin: 20px 0;
}
#author-container {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.user-card {
border-radius: 15px;
width: 300px;
height: 350px;
background-color: var(--light-grey);
margin: 20px;
}
.user-img {
width: 150px;
height: 150px;
object-fit: cover;
}
.purple-divider {
background-color: var(--dark-purple);
width: 100%;
height: 15px;
}
.author-name {
margin: 10px;
}
.bio {
margin: 20px;
}
.error-msg {
color: var(--light-grey);
}
.btn {
cursor: pointer;
width: 200px;
margin: 10px;
color: var(--main-bg-color);
font-size: 14px;
background-color: var(--golden-yellow);
background-image: linear-gradient(#fecc4c, #ffac33);
border-color: var(--golden-yellow);
border-width: 3px;
}
```
```js
const authorContainer = document.getElementById('author-container');
const loadMoreBtn = document.getElementById('load-more-btn');
let startingIndex = 0;
let endingIndex = 8;
let authorDataArr = [];
--fcc-editable-region--
fetch('https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json')
.then((res) => res.json())
.then((data) => {
authorDataArr = data;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
})
.catch((err) => {
authorContainer.innerHTML = '<p class="error-msg">There was an error loading the authors</p>';
});
--fcc-editable-region--
const fetchMoreAuthors = () => {
startingIndex += 8;
endingIndex += 8;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
if (authorDataArr.length <= endingIndex) {
loadMoreBtn.disabled = true;
loadMoreBtn.style.cursor = "not-allowed"
loadMoreBtn.textContent = 'No more data to load';
}
};
const displayAuthors = (authors) => {
authors.forEach(({ author, image, url, bio }, index) => {
authorContainer.innerHTML += `
<div id="${index}" class="user-card">
<h2 class="author-name">${author}</h2>
<img class="user-img" src="${image}" alt="${author} avatar">
<div class="purple-divider"></div>
<p class="bio">${bio.length > 50 ? bio.slice(0, 50) + '...' : bio}</p>
<a class="author-link" href="${url}" target="_blank">${author} author page</a>
</div>
`;
});
};
loadMoreBtn.addEventListener('click', fetchMoreAuthors);
```
@@ -0,0 +1,175 @@
---
id: 69e14a2fd8ecf9210c0739ee
title: Step 26
challengeType: 0
dashedName: step-26
---
# --description--
When calling an asynchronous function, you can either await the function's return or you can let it run asynchronously. If you had any code that depends on the `initialFetch` data being returned, you would want to await the function call, but since you don't have any such dependency, you can go ahead and just call the function asynchronously.
Add a function call to `initialFetch` in the indicated space in the editor.
# --hints--
You should call `initialFetch` without any arguments.
```js
assert.match(code, /^initialFetch\(\s*\)/m);
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>freeCodeCamp News Author Page</title>
<link rel="stylesheet" href="./styles.css" />
</head>
<body>
<h1 class="title">freeCodeCamp News Author Page</h1>
<main>
<div id="author-container"></div>
<button class="btn" id="load-more-btn">Load More Authors</button>
</main>
<script src="./script.js"></script>
</body>
</html>
```
```css
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
:root {
--main-bg-color: #1b1b32;
--light-grey: #f5f6f7;
--dark-purple: #5a01a7;
--golden-yellow: #feac32;
}
body {
background-color: var(--main-bg-color);
text-align: center;
}
.title {
color: var(--light-grey);
margin: 20px 0;
}
#author-container {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.user-card {
border-radius: 15px;
width: 300px;
height: 350px;
background-color: var(--light-grey);
margin: 20px;
}
.user-img {
width: 150px;
height: 150px;
object-fit: cover;
}
.purple-divider {
background-color: var(--dark-purple);
width: 100%;
height: 15px;
}
.author-name {
margin: 10px;
}
.bio {
margin: 20px;
}
.error-msg {
color: var(--light-grey);
}
.btn {
cursor: pointer;
width: 200px;
margin: 10px;
color: var(--main-bg-color);
font-size: 14px;
background-color: var(--golden-yellow);
background-image: linear-gradient(#fecc4c, #ffac33);
border-color: var(--golden-yellow);
border-width: 3px;
}
```
```js
const authorContainer = document.getElementById('author-container');
const loadMoreBtn = document.getElementById('load-more-btn');
let startingIndex = 0;
let endingIndex = 8;
let authorDataArr = [];
const initialFetch = async () => {
fetch('https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json')
.then((res) => res.json())
.then((data) => {
authorDataArr = data;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
})
.catch((err) => {
authorContainer.innerHTML = '<p class="error-msg">There was an error loading the authors</p>';
});
}
const fetchMoreAuthors = () => {
startingIndex += 8;
endingIndex += 8;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
if (authorDataArr.length <= endingIndex) {
loadMoreBtn.disabled = true;
loadMoreBtn.style.cursor = "not-allowed"
loadMoreBtn.textContent = 'No more data to load';
}
};
const displayAuthors = (authors) => {
authors.forEach(({ author, image, url, bio }, index) => {
authorContainer.innerHTML += `
<div id="${index}" class="user-card">
<h2 class="author-name">${author}</h2>
<img class="user-img" src="${image}" alt="${author} avatar">
<div class="purple-divider"></div>
<p class="bio">${bio.length > 50 ? bio.slice(0, 50) + '...' : bio}</p>
<a class="author-link" href="${url}" target="_blank">${author} author page</a>
</div>
`;
});
};
--fcc-editable-region--
--fcc-editable-region--
loadMoreBtn.addEventListener('click', fetchMoreAuthors);
```
@@ -0,0 +1,201 @@
---
id: 69e16a610b33e847d85be16e
title: Step 27
challengeType: 0
dashedName: step-27
---
# --description--
At this point, the behaviour of the app should not have changed. The code still fetches a file from the CDN and then processes the retrieved data into `JSON`. Once that's done, it saves that data into the `authorDataArr` variable and then calls `displayAuthors`.
Modify the call to `fetch` so that it uses the `await` operator. Save the result in a new `const` variable called `res`. The new variable should be locally defined within `initialFetch`.
Given this code:
```js
fetch('https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json')
```
You would write:
```js
await fetch('https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json')
```
You may see a `SyntaxError`. This can be ignored for now.
# --before-all--
```js
window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
```
# --hints--
You should use the `await` keyword to await the `fetch` call.
```js
assert.match(code, /await\s+fetch\(\s*('|"|`)https:\/\/cdn\.freecodecamp\.org\/curriculum\/news\-author\-page\/authors\.json\1\s*\)/)
```
You should save the result of the awaited `fetch` call in a local `const` variable called `res`.
```js
assert.match(code, /^\s*const\s+res\s*=\s*await\s+fetch\(\s*('|"|`)https:\/\/cdn\.freecodecamp\.org\/curriculum\/news\-author\-page\/authors\.json\1\s*\)/m)
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>freeCodeCamp News Author Page</title>
<link rel="stylesheet" href="./styles.css" />
</head>
<body>
<h1 class="title">freeCodeCamp News Author Page</h1>
<main>
<div id="author-container"></div>
<button class="btn" id="load-more-btn">Load More Authors</button>
</main>
<script src="./script.js"></script>
</body>
</html>
```
```css
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
:root {
--main-bg-color: #1b1b32;
--light-grey: #f5f6f7;
--dark-purple: #5a01a7;
--golden-yellow: #feac32;
}
body {
background-color: var(--main-bg-color);
text-align: center;
}
.title {
color: var(--light-grey);
margin: 20px 0;
}
#author-container {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.user-card {
border-radius: 15px;
width: 300px;
height: 350px;
background-color: var(--light-grey);
margin: 20px;
}
.user-img {
width: 150px;
height: 150px;
object-fit: cover;
}
.purple-divider {
background-color: var(--dark-purple);
width: 100%;
height: 15px;
}
.author-name {
margin: 10px;
}
.bio {
margin: 20px;
}
.error-msg {
color: var(--light-grey);
}
.btn {
cursor: pointer;
width: 200px;
margin: 10px;
color: var(--main-bg-color);
font-size: 14px;
background-color: var(--golden-yellow);
background-image: linear-gradient(#fecc4c, #ffac33);
border-color: var(--golden-yellow);
border-width: 3px;
}
```
```js
const authorContainer = document.getElementById('author-container');
const loadMoreBtn = document.getElementById('load-more-btn');
let startingIndex = 0;
let endingIndex = 8;
let authorDataArr = [];
const initialFetch = async () => {
--fcc-editable-region--
fetch('https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json')
--fcc-editable-region--
.then((res) => res.json())
.then((data) => {
authorDataArr = data;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
})
.catch((err) => {
authorContainer.innerHTML = '<p class="error-msg">There was an error loading the authors</p>';
});
}
const fetchMoreAuthors = () => {
startingIndex += 8;
endingIndex += 8;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
if (authorDataArr.length <= endingIndex) {
loadMoreBtn.disabled = true;
loadMoreBtn.style.cursor = "not-allowed"
loadMoreBtn.textContent = 'No more data to load';
}
};
const displayAuthors = (authors) => {
authors.forEach(({ author, image, url, bio }, index) => {
authorContainer.innerHTML += `
<div id="${index}" class="user-card">
<h2 class="author-name">${author}</h2>
<img class="user-img" src="${image}" alt="${author} avatar">
<div class="purple-divider"></div>
<p class="bio">${bio.length > 50 ? bio.slice(0, 50) + '...' : bio}</p>
<a class="author-link" href="${url}" target="_blank">${author} author page</a>
</div>
`;
});
};
initialFetch();
loadMoreBtn.addEventListener('click', fetchMoreAuthors);
```
@@ -0,0 +1,208 @@
---
id: 69e1e83ac6424325f77331e8
title: Step 28
challengeType: 0
dashedName: step-28
---
# --description--
Next, change the line of code that calls the `json` method to use the `await` operator instead.
For example, given this code:
```js
.then((res) => res.json());
```
You would write:
```js
await res.json();
```
Then, store the result in your `authorDataArr`, and move the line of code that calls `displayAuthors` so it is immediately following your new `await` statement.
Finally, delete the remaining `then` statement and its code block as it no longer serves any purpose.
You will notice a `SyntaxError` in the console at this point. The next step will deal with refactoring the `catch` method to resolve this error.
# --before-all--
```js
window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});
```
# --hints--
You should assign the awaited result of `res.json()` to the `authorDataArr` variable from the global scope
```js
assert.match(code, /^\s*authorDataArr\s*=\s*await\s+res\.json\(\s*\)\s*;?/m)
```
`displayAuthors` should still be called as before
```js
assert.match(code, /^\s*displayAuthors\(\s*authorDataArr\.slice\(\s*startingIndex\s*,\s*endingIndex\s*\)\s*\)\s*;?/m)
```
You should no longer have any chained `then` methods
```js
assert.notMatch(code, /\.then\(/);
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>freeCodeCamp News Author Page</title>
<link rel="stylesheet" href="./styles.css" />
</head>
<body>
<h1 class="title">freeCodeCamp News Author Page</h1>
<main>
<div id="author-container"></div>
<button class="btn" id="load-more-btn">Load More Authors</button>
</main>
<script src="./script.js"></script>
</body>
</html>
```
```css
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
:root {
--main-bg-color: #1b1b32;
--light-grey: #f5f6f7;
--dark-purple: #5a01a7;
--golden-yellow: #feac32;
}
body {
background-color: var(--main-bg-color);
text-align: center;
}
.title {
color: var(--light-grey);
margin: 20px 0;
}
#author-container {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.user-card {
border-radius: 15px;
width: 300px;
height: 350px;
background-color: var(--light-grey);
margin: 20px;
}
.user-img {
width: 150px;
height: 150px;
object-fit: cover;
}
.purple-divider {
background-color: var(--dark-purple);
width: 100%;
height: 15px;
}
.author-name {
margin: 10px;
}
.bio {
margin: 20px;
}
.error-msg {
color: var(--light-grey);
}
.btn {
cursor: pointer;
width: 200px;
margin: 10px;
color: var(--main-bg-color);
font-size: 14px;
background-color: var(--golden-yellow);
background-image: linear-gradient(#fecc4c, #ffac33);
border-color: var(--golden-yellow);
border-width: 3px;
}
```
```js
const authorContainer = document.getElementById('author-container');
const loadMoreBtn = document.getElementById('load-more-btn');
let startingIndex = 0;
let endingIndex = 8;
let authorDataArr = [];
const initialFetch = async () => {
const res = await fetch('https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json');
--fcc-editable-region--
.then((res) => res.json())
.then((data) => {
authorDataArr = data;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
})
--fcc-editable-region--
.catch((err) => {
authorContainer.innerHTML = '<p class="error-msg">There was an error loading the authors</p>';
});
}
const fetchMoreAuthors = () => {
startingIndex += 8;
endingIndex += 8;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
if (authorDataArr.length <= endingIndex) {
loadMoreBtn.disabled = true;
loadMoreBtn.style.cursor = "not-allowed"
loadMoreBtn.textContent = 'No more data to load';
}
};
const displayAuthors = (authors) => {
authors.forEach(({ author, image, url, bio }, index) => {
authorContainer.innerHTML += `
<div id="${index}" class="user-card">
<h2 class="author-name">${author}</h2>
<img class="user-img" src="${image}" alt="${author} avatar">
<div class="purple-divider"></div>
<p class="bio">${bio.length > 50 ? bio.slice(0, 50) + '...' : bio}</p>
<a class="author-link" href="${url}" target="_blank">${author} author page</a>
</div>
`;
});
};
initialFetch();
loadMoreBtn.addEventListener('click', fetchMoreAuthors);
```
@@ -0,0 +1,383 @@
---
id: 69e1f5fa037cd7c2c4d6b8eb
title: Step 29
challengeType: 0
dashedName: step-29
---
# --description--
Finally, you need to deal with the `catch` method. First, nest the `fetch` statement, the `json` statement, and the displayAuthors call into a `try` block within `initialFetch`. Then, modify the chained `catch` method to be a catch block instead as per the example shown below.
```js
try {
// code that can cause or throw an error goes in this block
} catch (error) {
// error handling code here
}
```
If you've done this correctly, the `try` block will contain three lines of code in it and the `catch` block will contain just one line of code. Also, the `SyntaxError` will be resolved and the app should function normally.
Give yourself a pat on the back! You have learned how to make your asynchronous code more readable using the `async` and `await` operators! Now your author page is complete.
# --before-all--
```js
const testData = [{ author: 'Whoever', image: 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }];
window.fetch = () => Promise.resolve({json: () => Promise.resolve(testData)});
```
# --hints--
You should create a `try/catch` block
```js
assert.match(code, /try\s*\{[\s\S]*?\}\s*catch\s*\([^)]*\)\s*\{/);
```
The `catch` should no longer be a chained method
```js
assert.notMatch(code, /\.catch/);
```
The `try` block should contain the three statements that fetch the data, create the `json` and then display it.
```js
const tryBlockRegex =
/try\s*\{([\s\S]*?)\}(?=\s*(catch|finally)\b|\s*$)/;
const fetchLineRegex =
/const\s+res\s*=\s*await\s+fetch\(\s*('|"|`)https:\/\/cdn\.freecodecamp\.org\/curriculum\/news\-author\-page\/authors\.json\1,*\s*\)/;
const jsonLineRegex =
/authorDataArr\s*=\s*await\s+res\.json\(\)/;
const displayLineRegex =
/displayAuthors\(authorDataArr\.slice\(startingIndex,\s*endingIndex\)\)/;
const match = code.match(tryBlockRegex);
assert.isDefined(match);
const tryBlockContents = match[1];
assert.isTrue(fetchLineRegex.test(tryBlockContents));
assert.isTrue(jsonLineRegex.test(tryBlockContents));
assert.isTrue(displayLineRegex.test(tryBlockContents));
```
The fCC Authors Page should be rendering correctly
```js
assert.equal(document.querySelector('.author-name').innerText, `Whoever`);
assert.equal(document.querySelector('img')?.getAttribute('alt'), `Whoever avatar`);
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>freeCodeCamp News Author Page</title>
<link rel="stylesheet" href="./styles.css" />
</head>
<body>
<h1 class="title">freeCodeCamp News Author Page</h1>
<main>
<div id="author-container"></div>
<button class="btn" id="load-more-btn">Load More Authors</button>
</main>
<script src="./script.js"></script>
</body>
</html>
```
```css
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
:root {
--main-bg-color: #1b1b32;
--light-grey: #f5f6f7;
--dark-purple: #5a01a7;
--golden-yellow: #feac32;
}
body {
background-color: var(--main-bg-color);
text-align: center;
}
.title {
color: var(--light-grey);
margin: 20px 0;
}
#author-container {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.user-card {
border-radius: 15px;
width: 300px;
height: 350px;
background-color: var(--light-grey);
margin: 20px;
}
.user-img {
width: 150px;
height: 150px;
object-fit: cover;
}
.purple-divider {
background-color: var(--dark-purple);
width: 100%;
height: 15px;
}
.author-name {
margin: 10px;
}
.bio {
margin: 20px;
}
.error-msg {
color: var(--light-grey);
}
.btn {
cursor: pointer;
width: 200px;
margin: 10px;
color: var(--main-bg-color);
font-size: 14px;
background-color: var(--golden-yellow);
background-image: linear-gradient(#fecc4c, #ffac33);
border-color: var(--golden-yellow);
border-width: 3px;
}
```
```js
const authorContainer = document.getElementById('author-container');
const loadMoreBtn = document.getElementById('load-more-btn');
let startingIndex = 0;
let endingIndex = 8;
let authorDataArr = [];
const initialFetch = async () => {
--fcc-editable-region--
const res = await fetch('https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json');
authorDataArr = await res.json();
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
.catch((err) => {
authorContainer.innerHTML = '<p class="error-msg">There was an error loading the authors</p>';
});
--fcc-editable-region--
}
const fetchMoreAuthors = () => {
startingIndex += 8;
endingIndex += 8;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
if (authorDataArr.length <= endingIndex) {
loadMoreBtn.disabled = true;
loadMoreBtn.style.cursor = "not-allowed"
loadMoreBtn.textContent = 'No more data to load';
}
};
const displayAuthors = (authors) => {
authors.forEach(({ author, image, url, bio }, index) => {
authorContainer.innerHTML += `
<div id="${index}" class="user-card">
<h2 class="author-name">${author}</h2>
<img class="user-img" src="${image}" alt="${author} avatar">
<div class="purple-divider"></div>
<p class="bio">${bio.length > 50 ? bio.slice(0, 50) + '...' : bio}</p>
<a class="author-link" href="${url}" target="_blank">${author} author page</a>
</div>
`;
});
};
initialFetch();
loadMoreBtn.addEventListener('click', fetchMoreAuthors);
```
# --solutions--
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>freeCodeCamp News Author Page</title>
<link rel="stylesheet" href="./styles.css" />
</head>
<body>
<h1 class="title">freeCodeCamp News Author Page</h1>
<main>
<div id="author-container"></div>
<button class="btn" id="load-more-btn">Load More Authors</button>
</main>
<script src="./script.js"></script>
</body>
</html>
```
```css
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
:root {
--main-bg-color: #1b1b32;
--light-grey: #f5f6f7;
--dark-purple: #5a01a7;
--golden-yellow: #feac32;
}
body {
background-color: var(--main-bg-color);
text-align: center;
}
.title {
color: var(--light-grey);
margin: 20px 0;
}
#author-container {
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.user-card {
border-radius: 15px;
width: 300px;
height: 350px;
background-color: var(--light-grey);
margin: 20px;
}
.user-img {
width: 150px;
height: 150px;
object-fit: cover;
}
.purple-divider {
background-color: var(--dark-purple);
width: 100%;
height: 15px;
}
.author-name {
margin: 10px;
}
.bio {
margin: 20px;
}
.error-msg {
color: var(--light-grey);
}
.btn {
cursor: pointer;
width: 200px;
margin: 10px;
color: var(--main-bg-color);
font-size: 14px;
background-color: var(--golden-yellow);
background-image: linear-gradient(#fecc4c, #ffac33);
border-color: var(--golden-yellow);
border-width: 3px;
}
```
```js
const authorContainer = document.getElementById("author-container");
const loadMoreBtn = document.getElementById("load-more-btn");
let startingIndex = 0;
let endingIndex = 8;
let authorDataArr = [];
const initialFetch = async () => {
try {
const res = await fetch(
"https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json"
);
authorDataArr = await res.json();
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
} catch (err) {
authorContainer.innerHTML =
'<p class="error-msg">There was an error loading the authors</p>';
}
}
const fetchMoreAuthors = () => {
startingIndex += 8;
endingIndex += 8;
displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
if (authorDataArr.length <= endingIndex) {
loadMoreBtn.disabled = true;
loadMoreBtn.style.cursor = "not-allowed";
loadMoreBtn.textContent = "No more data to load";
}
};
const displayAuthors = (authors) => {
authors.forEach(({ author, image, url, bio }, index) => {
authorContainer.innerHTML += `
<div id="${index}" class="user-card">
<h2 class="author-name">${author}</h2>
<img class="user-img" src="${image}" alt="${author} avatar">
<div class="purple-divider"></div>
<p class="bio">${bio.length > 50 ? bio.slice(0, 50) + "..." : bio}</p>
<a class="author-link" href="${url}" target="_blank">${author} author page</a>
</div>
`;
});
};
initialFetch();
loadMoreBtn.addEventListener("click", fetchMoreAuthors);
```
@@ -6,102 +6,35 @@
"hasEditableBoundaries": true,
"dashedName": "workshop-fcc-authors-page",
"challengeOrder": [
{
"id": "641d9a19bff38d34d5a5edb8",
"title": "Step 1"
},
{
"id": "641da3c6b6fbd742bff6ee40",
"title": "Step 2"
},
{
"id": "641da42481d90c4314c99e94",
"title": "Step 3"
},
{
"id": "641da465273051435d332b15",
"title": "Step 4"
},
{
"id": "641da4b16937be43ba24c63d",
"title": "Step 5"
},
{
"id": "641da51a9810e74411262fcc",
"title": "Step 6"
},
{
"id": "641da5462576784453146ec2",
"title": "Step 7"
},
{
"id": "641da5abaac81844a54adb03",
"title": "Step 8"
},
{
"id": "641da73b09e7f046c758e0ed",
"title": "Step 9"
},
{
"id": "641da791d0c34a472b8d15b6",
"title": "Step 10"
},
{
"id": "641da7bfbc7f0f477438ad8a",
"title": "Step 11"
},
{
"id": "641da803d9892447d059804e",
"title": "Step 12"
},
{
"id": "641da836581c254815f785fe",
"title": "Step 13"
},
{
"id": "641da86294fd9f485d3c2bf0",
"title": "Step 14"
},
{
"id": "641da895fb7ec648a5bdf19c",
"title": "Step 15"
},
{
"id": "641da8db2a036048ebe6999e",
"title": "Step 16"
},
{
"id": "641da97c987a514959ada414",
"title": "Step 17"
},
{
"id": "641da9aceb788e49a73ebcc9",
"title": "Step 18"
},
{
"id": "641da9ea9b847a49fe6ee9b6",
"title": "Step 19"
},
{
"id": "641daa5ea050f24a7cade6e6",
"title": "Step 20"
},
{
"id": "641daa8c2c3e364ac3650b37",
"title": "Step 21`"
},
{
"id": "641daabed8d0584b1150c953",
"title": "Step 22"
},
{
"id": "641daae5e18eae4b562633e4",
"title": "Step 23"
},
{
"id": "641dab13c1b6f14b9828e6b1",
"title": "Step 24"
}
{ "id": "641d9a19bff38d34d5a5edb8", "title": "Step 1" },
{ "id": "641da3c6b6fbd742bff6ee40", "title": "Step 2" },
{ "id": "641da42481d90c4314c99e94", "title": "Step 3" },
{ "id": "641da465273051435d332b15", "title": "Step 4" },
{ "id": "641da4b16937be43ba24c63d", "title": "Step 5" },
{ "id": "641da51a9810e74411262fcc", "title": "Step 6" },
{ "id": "641da5462576784453146ec2", "title": "Step 7" },
{ "id": "641da5abaac81844a54adb03", "title": "Step 8" },
{ "id": "641da73b09e7f046c758e0ed", "title": "Step 9" },
{ "id": "641da791d0c34a472b8d15b6", "title": "Step 10" },
{ "id": "641da7bfbc7f0f477438ad8a", "title": "Step 11" },
{ "id": "641da803d9892447d059804e", "title": "Step 12" },
{ "id": "641da836581c254815f785fe", "title": "Step 13" },
{ "id": "641da86294fd9f485d3c2bf0", "title": "Step 14" },
{ "id": "641da895fb7ec648a5bdf19c", "title": "Step 15" },
{ "id": "641da8db2a036048ebe6999e", "title": "Step 16" },
{ "id": "641da97c987a514959ada414", "title": "Step 17" },
{ "id": "641da9aceb788e49a73ebcc9", "title": "Step 18" },
{ "id": "641da9ea9b847a49fe6ee9b6", "title": "Step 19" },
{ "id": "641daa5ea050f24a7cade6e6", "title": "Step 20" },
{ "id": "641daa8c2c3e364ac3650b37", "title": "Step 21" },
{ "id": "641daabed8d0584b1150c953", "title": "Step 22" },
{ "id": "641daae5e18eae4b562633e4", "title": "Step 23" },
{ "id": "641dab13c1b6f14b9828e6b1", "title": "Step 24" },
{ "id": "69df434b56d2e0faf1a7424c", "title": "Step 25" },
{ "id": "69e14a2fd8ecf9210c0739ee", "title": "Step 26" },
{ "id": "69e16a610b33e847d85be16e", "title": "Step 27" },
{ "id": "69e1e83ac6424325f77331e8", "title": "Step 28" },
{ "id": "69e1f5fa037cd7c2c4d6b8eb", "title": "Step 29" }
],
"helpCategory": "JavaScript"
}