Basic

// App.js
import List from './List.js';
import Row from './Row.js';
import { products } from './data.js';

export default function App() {
  return (
    <List
      items={products}
      renderItem={(product, isHighlighted) =>
        <Row
          key={product.id}
          title={product.title}
          isHighlighted={isHighlighted}
        />
      }
    />
  );
}

// List.js
import { useState } from 'react';

export default function List({ items, renderItem }) {
  const [selectedIndex, setSelectedIndex] = useState(0);
  return (
    <div className="List">
      {items.map((item, index) => {
        const isHighlighted = index === selectedIndex;
        return renderItem(item, isHighlighted);
      })}
      <hr />
      <button onClick={() => {
        setSelectedIndex(i =>
          (i + 1) % items.length
        );
      }}>
        Next
      </button>
    </div>
  );
}

Custom Hook

// App.js
import Row from './Row.js';
import useList from './useList.js';
import { products } from './data.js';

export default function App() {
  const [selected, onNext] = useList(products);
  return (
    <div className="List">
      {products.map(product =>
        <Row
          key={product.id}
          title={product.title}
          isHighlighted={selected === product}
        />
      )}
      <hr />
      <button onClick={onNext}>
        Next
      </button>
    </div>
  );
}

참조