Ada-Ac2: Catherine Bandarchuk-React-ChatLog #2
Conversation
| const calculateLikes = (entries) => { | ||
| let total = 0; | ||
| for (const entry of entries) { | ||
| if (entry.liked) { | ||
| total++; | ||
| } | ||
| } | ||
| return total; | ||
| }; |
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Great use of the existing message data to derive the number of liked messages! Another option could be to use a higher order function like array.reduce to take our list of messages and reduce it down to a single value:
// This could be returned from a helper function
// totalLikes is a variable that accumulates a value as we loop over each entry in chatEntryData
const likesCount = chatEntryData.reduce((totalLikes, currentMessage) => {
// If currentMessage.liked is true add 1 to totalLikes, else add 0
return (totalLikes += currentMessage.liked ? 1 : 0);
}, 0); // The 0 here sets the initial value of totalLikes to 0| const updateLikes = () => { | ||
| const updateEntry = { | ||
| id: props.id, | ||
| sender: props.sender, | ||
| body: props.body, | ||
| timeStamp: props.timeStamp, | ||
| liked: !props.liked, | ||
| }; | ||
| props.onUpdate(updateEntry); | ||
| }; |
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I would consider passing the id of the message clicked to props.onUpdate and having the App code handle the new object creation. When ChatEntry creates the new object for the App state, it takes some responsibility for managing those contents. If we want the responsibility of managing the state to live solely with App, we would want it to handle defining the new message object.
This made me think of a related concept in secure design for APIs. Imagine we had an API for creating and updating messages, and it has an endpoint /<msg_id>/like meant to update the true/false liked value. We could have that endpoint accept a body in the request and let the user send an object with data for the message's record (similar to passing a message object from ChatEntry to App), but the user could choose to send any data for those values. If the endpoint only takes in an id and handles updating the liked status for the message itself, there is less opportunity for user error or malicious action.
| return ( | ||
| <div className="chat-entry local"> | ||
| <h2 className="entry-name">Replace with name of sender</h2> | ||
| <div className={bubbleClass}> |
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Another option could be to have an interpolated string here that always holds chat-entry and use a placeholder where we pass only the remote or local class name (so we don't repeat chat-entry anywhere):
const bubbleClass = (props.sender === 'Vladimir') ? 'local' : 'remote';
...
<div className={`chat-entry ${bubbleClass}`}>| }; | ||
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| ChatLog.propTypes = { | ||
| messages: PropTypes.arrayOf( |
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Really nice use of PropTypes.
2 participants
Did not implement optional wave4 functionality completely.