const [elemList, setElemList] = useState(blockList);

  const getArrList = elemList.map((elem, index) => {
    const handleClick = () => {

      const newElem = {...elem, name: Math.random(10)}
      const newList = elemList.slice();
      newList[index] = newElem;

      setElemList(newList);
    }
    return (
      <div className="block-elem" key={index} onClick={handleClick}>
        {elem.name}
      </div>
    )
  })

const [elemList, setElemList] = useState(blockList);

  const getArrList = elemList.map((elem, index) => {
    const handleClick = () => {

      const newElem = {...elem, name: Math.random(10)}
      const newList = elemList.slice();
      newList[index] = newElem;

      setElemList(newList);
    }
    return (
      <div className="block-elem" key={index} onClick={handleClick}>
        {elem.name}
      </div>
    )
  })