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accommodate.jsx

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+import React, { useState, useEffect } from "react";
+import useCounter from "./useCounter";
+
+const MAX_CAPACITY = 10;
+
+function Accommodate(props) {
+    const [isFull, setIsFull] = useState(false);
+    const [count, increaseCount, decreaseCount] = useCounter(0);
+
+    useEffect(() => {
+        console.log("======================");
+        console.log("useEffect() is called.");
+        console.log(`isFull: ${isFull}`);
+    });
+
+    useEffect(() => {
+        setIsFull(count >= MAX_CAPACITY);
+        console.log(`Current count value: ${count}`);
+    }, [count]);
+
+    return (
+        <div style={{ padding: 16 }}>
+            <p>{`총 ${count}명 수용했습니다.`}</p>
+
+            <button onClick={increaseCount} disabled={isFull}>
+                입장
+            </button>
+            <button onClick={decreaseCount}>퇴장</button>
+
+            {isFull && <p style={{ color: "red" }}>정원이 가득찼습니다.</p>}
+        </div>
+    );
+}
+
+export default Accommodate;

useConter.jsx

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+import React, { useState } from "react";
+
+function useCounter(initialValue) {
+    const [count, setCount] = useState(initialValue);
+
+    const increaseCount = () => setCount((count) => count + 1);
+    const decreaseCount = () => setCount((count) => Math.max(count - 1, 0));
+
+    return [count, increaseCount, decreaseCount];
+}
+
+export default useCounter;