Created
December 1, 2020 15:05
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Print message to the screen every 1 second
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| import React from "react"; | |
| const PrintMessage = () => { | |
| const fontFamilies = ["arial", "cursive", "monospace", "sans-serif", "sans"]; | |
| let [count, setCount] = React.useState(0); | |
| const printMessage = () => { | |
| return <span className={`${fontFamilies[count]} world`}>World</span>; | |
| }; | |
| useInterval(() => { | |
| // Your custom logic here | |
| if (count < fontFamilies.length - 1) { | |
| setCount(count + 1); | |
| } else { | |
| setCount(0); | |
| } | |
| }, 1000); | |
| function useInterval(callback, delay) { | |
| const savedCallback = React.useRef(); | |
| // Remember the latest function. | |
| React.useEffect(() => { | |
| savedCallback.current = callback; | |
| }, [callback]); | |
| // Set up the interval. | |
| React.useEffect(() => { | |
| function tick() { | |
| savedCallback.current(); | |
| } | |
| if (delay !== null) { | |
| let id = setInterval(tick, delay); | |
| return () => clearInterval(id); | |
| } | |
| }, [delay]); | |
| } | |
| return ( | |
| <div> | |
| <h3>Hello {printMessage()}</h3> | |
| </div> | |
| ); | |
| }; | |
| export default PrintMessage; |
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