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| const todos = [
[
{ id: 1, value: 'Wash dishes' },
{ id: 2, value: 'Clean the bed' },
{ id: 3, value: 'Running' },
{ id: 4, value: 'Learning' }
],
[
{ id: 4, value: 'Learning' },
{ id: 1, value: 'Wash dishes' },
{ id: 2, value: 'Clean the bed' },
{ id: 3, value: 'Running' },
]
,
[
{ id: 2, value: 'Clean the bed' },
{ id: 4, value: 'Learning' },
{ id: 1, value: 'Wash dishes' },
{ id: 3, value: 'Running' },
]
,
[
{ id: 2, value: 'Clean the bed' },
{ id: 3, value: 'Running' },
{ id: 4, value: 'Learning' },
{ id: 1, value: 'Wash dishes' },
]
]
function App() {
const [items, setItems] = React.useState(todos[0])
React.useEffect(() => {
const interval = setInterval(() => {
const random = Math.floor(Math.random() * 3)
setItems(todos[random])
}, 1000)
return () => {
clearInterval(interval)
}
}, [])
const handleDoneClick = (todo) => {
setItems(items => items.filter(item => item !== todo))
}
const handleRestoreClick = () => {
setItems(items => [...items, todos.find(item => !items.includes(item))])
}
return (
<>
{items.map((todo,index) => (
<div key={todo.id}>
<button onClick={() => handleDoneClick(todo)}>{todo.value}</button>
</div>
))}
<br />
<br />
<button onClick={handleRestoreClick}>Restore</button>
</>
);
}
ReactDOM.render(<App />, root)
|