export const useArray = <P>(persons: P[]) => {
  // hello，请把作业写在这里吧，写完记得再对照作业要求检查一下
  const [value, setValue] = useState(persons);

  const clear = () => {
    setValue([]);
  };
  const add = (item: P) => {
    setValue([
      ...value,
      item
    ]);
  };
  const removeIndex = (index: number) => {
    const newArray = value.slice()
    newArray.splice(index, 1)
    setValue(newArray)
  };

  return {
    value,
    clear,
    add,
    removeIndex
  };
};