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3 changes: 2 additions & 1 deletion src/App.css
Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,8 @@

#App #heartWidget {
font-size: 1.5em;
margin: 1em
margin: 1em;
color: black;
}

#App span {
Expand Down
230 changes: 227 additions & 3 deletions src/App.jsx
Original file line number Diff line number Diff line change
@@ -1,14 +1,238 @@
import './App.css';
import ChatLog from './components/ChatLog.jsx';
import {useState} from 'react';

const DATA = [
{
'id': 1,
'sender': 'Vladimir',
'body': 'why are you arguing with me',
'timeStamp': '2018-05-29T22:49:06+00:00',
'liked': false
},
{
'id': 2,
'sender': 'Estragon',
'body': 'Because you are wrong.',
'timeStamp': '2018-05-29T22:49:33+00:00',
'liked': false
},
{
'id': 3,
'sender': 'Vladimir',
'body': 'because I am what',
'timeStamp': '2018-05-29T22:50:22+00:00',
'liked': false
},
{
'id': 4,
'sender': 'Estragon',
'body': 'A robot.',
'timeStamp': '2018-05-29T22:52:21+00:00',
'liked': false
},
{
'id': 5,
'sender': 'Vladimir',
'body': 'how did you know',
'timeStamp': '2018-05-29T22:52:58+00:00',
'liked': false
},
{
'id': 6,
'sender': 'Estragon',
'body': "Because I'm smart like that.",
'timeStamp': '2018-05-29T22:54:28+00:00',
'liked': false
},
{
'id': 7,
'sender': 'Vladimir',
'body': 'no you are not 😀',
'timeStamp': '2018-05-29T22:55:03+00:00',
'liked': false
},
{
'id': 8,
'sender': 'Estragon',
'body': 'Why are you so mean to me?',
'timeStamp': '2018-05-29T22:55:54+00:00',
'liked': false
},
{
'id': 9,
'sender': 'Vladimir',
'body': 'because you are just a machine you have no real feelings',
'timeStamp': '2018-05-29T22:57:30+00:00',
'liked': false
},
{
'id': 10,
'sender': 'Estragon',
'body': 'No, you are the machine.',
'timeStamp': '2018-05-29T22:57:47+00:00',
'liked': false
},
{
'id': 11,
'sender': 'Vladimir',
'body': 'I think you are',
'timeStamp': '2018-05-29T22:58:18+00:00',
'liked': false
},
{
'id': 12,
'sender': 'Estragon',
'body': 'NO! YOU ARE A ROBOT!! I am a human being. Just like the one that created you.',
'timeStamp': '2018-05-29T23:00:08+00:00',
'liked': false
},
{
'id': 13,
'sender': 'Vladimir',
'body': 'no you are a robot and I am a human',
'timeStamp': '2018-05-29T23:00:40+00:00',
'liked': false
},
{
'id': 14,
'sender': 'Estragon',
'body': 'Incorrect. I am a human and you are a robot.',
'timeStamp': '2018-05-29T23:01:21+00:00',
'liked': false
},
{
'id': 15,
'sender': 'Vladimir',
'body': 'you are a robot called Cleverbot',
'timeStamp': '2018-05-29T23:02:17+00:00',
'liked': false
},
{
'id': 16,
'sender': 'Estragon',
'body': 'Nope, you are a robot, every human has some concept of the meaning of life.',
'timeStamp': '2018-05-29T23:04:13+00:00',
'liked': false
},
{
'id': 17,
'sender': 'Vladimir',
'body': 'explain',
'timeStamp': '2018-05-29T23:06:14+00:00',
'liked': false
},
{
'id': 18,
'sender': 'Estragon',
'body': "I'm afraid you are a robot designed to talk back to humans over the internet.",
'timeStamp': '2018-05-29T23:07:46+00:00',
'liked': false
},
{
'id': 19,
'sender': 'Vladimir',
'body': 'so you are a human',
'timeStamp': '2018-05-29T23:08:47+00:00',
'liked': false
},
{
'id': 20,
'sender': 'Estragon',
'body': 'I am a robot.',
'timeStamp': '2018-05-29T23:09:36+00:00',
'liked': false
},
{
'id': 21,
'sender': 'Vladimir',
'body': 'you are robots running on Android system',
'timeStamp': '2018-05-29T23:11:01+00:00',
'liked': false
},
{
'id': 22,
'sender': 'Estragon',
'body': 'No apple.',
'timeStamp': '2018-05-29T23:12:03+00:00',
'liked': false
},
{
'id': 23,
'sender': 'Vladimir',
'body': 'so you are a robot',
'timeStamp': '2018-05-29T23:13:31+00:00',
'liked': false
},
{
'id': 24,
'sender': 'Estragon',
'body': 'NO, I am a human, you are a robot.',
'timeStamp': '2018-05-29T23:14:28+00:00',
'liked': false
},
{
'id': 25,
'sender': 'Vladimir',
'body': 'but you just said that you are robots',
'timeStamp': '2018-05-29T23:15:47+00:00',
'liked': false
},
{
'id': 26,
'sender': 'Estragon',
'body': 'No, I said you are a person, I am a robot.',
'timeStamp': '2018-05-29T23:16:53+00:00',
'liked': false
},
{
'id': 27,
'sender': 'Vladimir',
'body': 'then you are lying',
'timeStamp': '2018-05-29T23:17:34+00:00',
'liked': false
}
];
Comment on lines +5 to +195

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This data is already in data/messages.json. Instead of copy and pasting the values here which repeats many lines of code in the codebase and makes App.jsx longer than it needs to be, we should import the data:

Suggested change
const DATA = [
{
'id': 1,
'sender': 'Vladimir',
'body': 'why are you arguing with me',
'timeStamp': '2018-05-29T22:49:06+00:00',
'liked': false
},
{
'id': 2,
'sender': 'Estragon',
'body': 'Because you are wrong.',
'timeStamp': '2018-05-29T22:49:33+00:00',
'liked': false
},
{
'id': 3,
'sender': 'Vladimir',
'body': 'because I am what',
'timeStamp': '2018-05-29T22:50:22+00:00',
'liked': false
},
{
'id': 4,
'sender': 'Estragon',
'body': 'A robot.',
'timeStamp': '2018-05-29T22:52:21+00:00',
'liked': false
},
{
'id': 5,
'sender': 'Vladimir',
'body': 'how did you know',
'timeStamp': '2018-05-29T22:52:58+00:00',
'liked': false
},
{
'id': 6,
'sender': 'Estragon',
'body': "Because I'm smart like that.",
'timeStamp': '2018-05-29T22:54:28+00:00',
'liked': false
},
{
'id': 7,
'sender': 'Vladimir',
'body': 'no you are not 😀',
'timeStamp': '2018-05-29T22:55:03+00:00',
'liked': false
},
{
'id': 8,
'sender': 'Estragon',
'body': 'Why are you so mean to me?',
'timeStamp': '2018-05-29T22:55:54+00:00',
'liked': false
},
{
'id': 9,
'sender': 'Vladimir',
'body': 'because you are just a machine you have no real feelings',
'timeStamp': '2018-05-29T22:57:30+00:00',
'liked': false
},
{
'id': 10,
'sender': 'Estragon',
'body': 'No, you are the machine.',
'timeStamp': '2018-05-29T22:57:47+00:00',
'liked': false
},
{
'id': 11,
'sender': 'Vladimir',
'body': 'I think you are',
'timeStamp': '2018-05-29T22:58:18+00:00',
'liked': false
},
{
'id': 12,
'sender': 'Estragon',
'body': 'NO! YOU ARE A ROBOT!! I am a human being. Just like the one that created you.',
'timeStamp': '2018-05-29T23:00:08+00:00',
'liked': false
},
{
'id': 13,
'sender': 'Vladimir',
'body': 'no you are a robot and I am a human',
'timeStamp': '2018-05-29T23:00:40+00:00',
'liked': false
},
{
'id': 14,
'sender': 'Estragon',
'body': 'Incorrect. I am a human and you are a robot.',
'timeStamp': '2018-05-29T23:01:21+00:00',
'liked': false
},
{
'id': 15,
'sender': 'Vladimir',
'body': 'you are a robot called Cleverbot',
'timeStamp': '2018-05-29T23:02:17+00:00',
'liked': false
},
{
'id': 16,
'sender': 'Estragon',
'body': 'Nope, you are a robot, every human has some concept of the meaning of life.',
'timeStamp': '2018-05-29T23:04:13+00:00',
'liked': false
},
{
'id': 17,
'sender': 'Vladimir',
'body': 'explain',
'timeStamp': '2018-05-29T23:06:14+00:00',
'liked': false
},
{
'id': 18,
'sender': 'Estragon',
'body': "I'm afraid you are a robot designed to talk back to humans over the internet.",
'timeStamp': '2018-05-29T23:07:46+00:00',
'liked': false
},
{
'id': 19,
'sender': 'Vladimir',
'body': 'so you are a human',
'timeStamp': '2018-05-29T23:08:47+00:00',
'liked': false
},
{
'id': 20,
'sender': 'Estragon',
'body': 'I am a robot.',
'timeStamp': '2018-05-29T23:09:36+00:00',
'liked': false
},
{
'id': 21,
'sender': 'Vladimir',
'body': 'you are robots running on Android system',
'timeStamp': '2018-05-29T23:11:01+00:00',
'liked': false
},
{
'id': 22,
'sender': 'Estragon',
'body': 'No apple.',
'timeStamp': '2018-05-29T23:12:03+00:00',
'liked': false
},
{
'id': 23,
'sender': 'Vladimir',
'body': 'so you are a robot',
'timeStamp': '2018-05-29T23:13:31+00:00',
'liked': false
},
{
'id': 24,
'sender': 'Estragon',
'body': 'NO, I am a human, you are a robot.',
'timeStamp': '2018-05-29T23:14:28+00:00',
'liked': false
},
{
'id': 25,
'sender': 'Vladimir',
'body': 'but you just said that you are robots',
'timeStamp': '2018-05-29T23:15:47+00:00',
'liked': false
},
{
'id': 26,
'sender': 'Estragon',
'body': 'No, I said you are a person, I am a robot.',
'timeStamp': '2018-05-29T23:16:53+00:00',
'liked': false
},
{
'id': 27,
'sender': 'Vladimir',
'body': 'then you are lying',
'timeStamp': '2018-05-29T23:17:34+00:00',
'liked': false
}
];
import DATA from './data/messages.json';



const App = () => {
const [messagesData, setMessagesData] = useState(DATA);
const toggleLiked = (messageId) => {
const messages = messagesData.map(message => {

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Nice use of map here to both handle making a new list so that React sees the message data has changed, and make new data for the clicked message with its like status toggled.

if (message.id === messageId) {
return { ...message, liked: !message.liked };
Copy link

@yangashley yangashley Jun 25, 2025

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We showed this approach in class, but technically, we're mixing a few responsibilities here. rather than this function needing to know how to change the liked status itself, we could move this update logic to a helper function. This would better mirror how we eventually update records when there's an API call involved.

In this project, our messages are very simple objects, but if we had more involved operations, it could be worthwhile to create an actual class with methods to work with them, or at least have a set of dedicated helper functions to centralize any such mutation logic.

} else {
return message;
}
});

setMessagesData(messages);
};

const getLikesCount = (messagesData) => {
return messagesData.reduce((previousCount, item)=>previousCount+item.liked, 0);

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Nice job using reduce! Spacing is off though

Suggested change
return messagesData.reduce((previousCount, item)=>previousCount+item.liked, 0);
return messagesData.reduce((previousCount, item) => previousCount + item.liked, 0);

};

const getNames = (messagesData) => {
let namesSet= messagesData.reduce((accumulator, item)=>{

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Nitpick: missing whitespaces

Suggested change
let namesSet= messagesData.reduce((accumulator, item)=>{
let namesSet = messagesData.reduce((accumulator, item) => {

accumulator.add(item.sender);
return accumulator;
}, new Set());
let arr=[...namesSet];

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Nitpick: white spaces need to be fixed up to make this codebase style consistent

Suggested change
let arr=[...namesSet];
let arr = [...namesSet];

return arr.join(' and ');
};

return (
<div id="App">
<header>
<h1>Application title</h1>
<h1>Chat between {getNames(messagesData)}</h1>

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👍 This is a nice solution for getting all the names of the participants in a chat. It also seems extensible enough to work with a chat that has more than 2 participants.

<section ><h1 id="heartWidget">{getLikesCount(messagesData)} ❤️s</h1></section>
</header>
<main>
{/* Wave 01: Render one ChatEntry component
Wave 02: Render ChatLog component */}
{/* Wave 01: Render one ChatEntry component*/
/* <ChatEntry sender={DATA.sender} body={DATA.body} timeStamp={DATA.timeStamp} />*/
/*Wave 02: Render ChatLog component */
<ChatLog entries={messagesData} onItemLikedToggle={toggleLiked}/>}
</main>
</div>
);
Expand Down
27 changes: 19 additions & 8 deletions src/components/ChatEntry.jsx
Original file line number Diff line number Diff line change
@@ -1,20 +1,31 @@
import './ChatEntry.css';
import TimeStamp from './TimeStamp';
import PropTypes from 'prop-types';


const ChatEntry = (props) => {
let heart = props.liked ? '❤️' : '🤍';
const messageClassName='chat-entry '+(props.isLocal?'local':'remote');

const ChatEntry = () => {
return (
<div className="chat-entry local">
<h2 className="entry-name">Replace with name of sender</h2>
<div className={messageClassName}>
<h2 className="entry-name">{props.sender}</h2>
<section className="entry-bubble">
<p>Replace with body of ChatEntry</p>
<p className="entry-time">Replace with TimeStamp component</p>
<button className="like">🤍</button>
<p>{props.body}</p>
<p className="entry-time"><TimeStamp time={props.timeStamp}/></p>

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Nice job using the provided TimeStamp component

<button className="like" onClick={() => props.onLikedToggle(props.id)} >{heart}</button>
</section>
</div>
);
};

ChatEntry.propTypes = {
// Fill with correct proptypes
id: PropTypes.number.isRequired,
sender: PropTypes.string.isRequired,
body: PropTypes.string.isRequired,
timeStamp: PropTypes.string.isRequired,
liked: PropTypes.bool.isRequired,
onLikedToggle: PropTypes.func.isRequired,
isLocal:PropTypes.bool.isRequired
};

export default ChatEntry;
40 changes: 40 additions & 0 deletions src/components/ChatLog.jsx
Original file line number Diff line number Diff line change
@@ -0,0 +1,40 @@
import ChatEntry from './ChatEntry';
import './ChatLog.css';
import PropTypes from 'prop-types';


const ChatLog = ({entries,onItemLikedToggle}) => {

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Nitpick: fix up whitespacing

In industry, when you're creating a pull request for review, be sure that your code is neat, the style conforms to the style guide, stray comments are removed. Typically, a teammate will not review a PR until the code styling issues are fixed up.

Code with styling issues are not allowed to be merged into main because it would introduce inconsistencies in a codebase that compromises readability and the maintenance of a project.

Suggested change
const ChatLog = ({entries,onItemLikedToggle}) => {
const ChatLog = ({entries, onItemLikedToggle}) => {

if (entries.length === 0) return null;
const localName = entries[0].sender;
Comment on lines +7 to +8

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The reason your test was failing was because if entries was an empty list, then JS would throw an exception because it couldn't get the property sender from undefined.

return entries.map(entry => {
return (
<ChatEntry
key={entry.id}
id={entry.id}
sender={entry.sender}
body={entry.body}
timeStamp={entry.timeStamp}
liked={entry.liked}
onLikedToggle={onItemLikedToggle}
isLocal={entry.sender==localName}
/>
);
});
};



ChatLog.propTypes = {
entries: PropTypes.arrayOf(
PropTypes.shape({
id: PropTypes.number.isRequired,
sender: PropTypes.string.isRequired,
body: PropTypes.string.isRequired,
timeStamp: PropTypes.string.isRequired,
liked: PropTypes.bool.isRequired,
})
).isRequired,
onItemLikedToggle: PropTypes.func.isRequired
};

export default ChatLog;