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export default function useData(initData) { | |
const [data, setData] = useState(initData); | |
useEffect(() => { | |
const intervalId = setInterval(async () => { | |
const newData = await fetch('https://data-api.com/getData').then(response => response.json()); | |
setData(newData); | |
}, 50000); | |
return () => { | |
clearInterval(intervalId); | |
}; |
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class StoppableClock extends Component { | |
constructor(props) { | |
super(props); | |
this.state = { | |
time: new Date().toLocaleTimeString(), | |
isRunning: true, | |
}; | |
} | |
componentDidMount() { | |
this.intervalId = setInterval(() => { |
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class StoppableClock extends Component { | |
constructor(props) { | |
super(props); | |
this.state = { | |
time: new Date().toLocaleTimeString(), | |
isRunning: true, | |
}; | |
} | |
componentDidMount() { | |
this.intervalId = setInterval(() => { |
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function StoppableClock({ className, style }) { | |
const [time, setTime] = useState(new Date().toLocaleTimeString()); | |
const [isRunning, setIsRunning] = useState(true); | |
const toggle = useCallback(() => { | |
setIsRunning(isRunning => !isRunning); | |
}, []); | |
useEffect(() => { | |
if (isRunning) { | |
const intervalId = setInterval(() => { | |
setTime(new Date().toLocaleTimeString()); |
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function Clock({ className, style }) { | |
const [time, setTime] = useState(new Date().toLocaleTimeString()); | |
useEffect(() => { | |
setInterval(() => { | |
setTime(new Date().toLocaleTimeString()); | |
}, 1000); | |
}, []); | |
return ( | |
<span | |
className={clsx('Clock', className)} |
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class Clock extends Component { | |
constructor(props) { | |
super(props); | |
this.state = { | |
time: new Date().toLocaleTimeString(), | |
}; | |
} | |
componentDidMount() { | |
setInterval(() => { | |
this.setState({ time: new Date().toLocaleTimeString() }); |
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