array.filter未返回reactjs中父数组的嵌套数组

function filterNestedArray(arr, predicate) {
  return arr.reduce((acc, curr) => {
    if (Array.isArray(curr)) {
      const filteredNestedArray = filterNestedArray(curr, predicate);
      if (filteredNestedArray.length > 0) {
        acc.push(filteredNestedArray);
      }
    } else if (predicate(curr)) {
      acc.push(curr);
    }
    return acc;
  }, []);
}

const nestedArray = [1, 2, [3, 4, [5, 6]], 7, [8, 9]];
const filteredArray = filterNestedArray(nestedArray, num => num % 2 === 0);
console.log(filteredArray); // 输出 [2, 4, 6, 8]

function filterNestedArray(arr, predicate) {
  return arr.map(item => {
    if (Array.isArray(item)) {
      const filteredNestedArray = filterNestedArray(item, predicate);
      return filteredNestedArray.length > 0 ? filteredNestedArray : undefined;
    }
    return predicate(item) ? item : undefined;
  }).filter(Boolean);
}

const nestedArray = [1, 2, [3, 4, [5, 6]], 7, [8, 9]];
const filteredArray = filterNestedArray(nestedArray, num => num % 2 === 0);
console.log(filteredArray); // 输出 [2, 4, 6, 8]