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change the way that merge state within useOptimistic demo #7375

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change the way that merge state within useOptimistic demo #7375

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23 changes: 14 additions & 9 deletions src/content/reference/react/useOptimistic.md
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Original file line number Diff line number Diff line change
Expand Up @@ -72,25 +72,30 @@ import { deliverMessage } from "./actions.js";
function Thread({ messages, sendMessage }) {
const formRef = useRef();
async function formAction(formData) {
addOptimisticMessage(formData.get("message"));
const message = {
key: new Date().getTime(),
text: formData.get("message")
};
addOptimisticMessage(message);
formRef.current.reset();
await sendMessage(formData);
await sendMessage(message);
}
const [optimisticMessages, addOptimisticMessage] = useOptimistic(
messages,
(state, newMessage) => [
...state,
//properly merge state by removing the duplicated message
...state.filter(msg => msg.key !== newMessage.key),
{
text: newMessage,
...newMessage,
sending: true
}
]
);

return (
<>
{optimisticMessages.map((message, index) => (
<div key={index}>
{optimisticMessages.map((message) => (
<div key={message.key}>
{message.text}
{!!message.sending && <small> (Sending...)</small>}
</div>
Expand All @@ -107,9 +112,9 @@ export default function App() {
const [messages, setMessages] = useState([
{ text: "Hello there!", sending: false, key: 1 }
]);
async function sendMessage(formData) {
const sentMessage = await deliverMessage(formData.get("message"));
setMessages((messages) => [...messages, { text: sentMessage }]);
async function sendMessage(message) {
const sentMessage = await deliverMessage(message);
setMessages((messages) => [...messages, sentMessage]);
}
return <Thread messages={messages} sendMessage={sendMessage} />;
}
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