ã€React】ãã‚ãã‚技術ブãƒã‚°ã§ setCount(count + 1) ã¨æ›¸ãã®ã¯ã‚„ã‚ã¾ã›ã‚“ã‹const [count, setCount] = useState(0); const increment = () => setCount(count + 1); const decrement = () => setCount(count - 1); const [count, setCount] = useState(0); const increment = () => setCount((prevCount) => prevCount + 1); const decrement = () => setCount((prevCount) => prevCount - 1);
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