[js] 第552天使用js实现一个数组flat()的方法 #3077

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[js] 第552天使用js实现一个数组flat()的方法#3077

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第552天使用js实现一个数组flat()的方法

我也要出题

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on Oct 18, 2020

function flat(arr) {
  let res = [];
  for (let i = 0; i < arr.length; i++) {
    let item = arr[i];
    if (item instanceof Array) {
      item = flat(item);
      res = res.concat(item);
    } else {
      res.push(item)
    }
  }
  return res;
}

const listData = [[1, 2], 3, 4, [5, [6, 8]]];

function flat(listData) {
  let _array = [];
  for (let index = 0; index < listData.length; index++) {
    const element = listData[index];
    if (element instanceof Array) {
      _array = _array.concat(flat(element));
    } else {
      _array.push(element);
    }
  }
  return _array;
}

console.log(flat(listData));

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