후크를 사용하여 React의 요소 배열에 대한 여러 참조를 관리하는 방법은 무엇입니까?

<code class="javascript">const { useRef, useState, useEffect } = React;

const App = () => {
  const elRef = useRef();
  const [elWidth, setElWidth] = useState();

  useEffect(() => {
    setElWidth(elRef.current.offsetWidth);
  }, []);

  return (
    <div>
      {[1, 2, 3].map(el => (
        <div ref={elRef} style={{ width: `${el * 100}px` }}>
          Width is: {elWidth}
        </div>
      ))}
    </div>
  );
};</code>

<code class="javascript">const App = props => {
  const itemsRef = useRef([]);
  // you can access the elements with itemsRef.current[n]

  useEffect(() => {
    itemsRef.current = itemsRef.current.slice(0, props.items.length);
  }, [props.items]);

  return props.items.map((item, i) => (
    <div
      key={i}
      ref={el => (itemsRef.current[i] = el)}
      style={{ width: `${(i + 1) * 100}px` }}
    >
      ...
    </div>
  ));
};</code>