useTransition - Web Dev Simplified

App.js Code

import { useState, useTransition } from 'react'


export default function App() {
    const [isPending, startTransaction] = useTransition();

    const [input, setInput] = useState("");
    const [list, setList] = useState([]);

    const LIST_SIZE = 20000;

    function handleChange(e) {
        setInput(e.target.value);

        startTransaction(() => {
            const l = [];
            for (let i = 0; i < LIST_SIZE; i++) {
                l.push(e.target.value);
            };
            setList(l);
        })
    }

    return (
        <>
            <input type="text" value={input} onChange={handleChange} />

            {isPending ? 'LOADING...' : list.map((item, index) => {
                return <span key={index}> {item} </span>
            })}
        </>
    )
}

Output

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