javascript - 在javascript中递归压缩数组对象

Question

我有一个对象数组，格式如下:

{
  "country": "India",
  "children": [
    {
      "name": "Karnataka",
      "type": "State",
      "children": [
        {
          "name": "",
          "type": "city"
        },
        {
          "name": "Bangalore",
          "type": "city"
        },
        {
          "name": "Mangalore",
          "type": "city"
        }
      ]
    },
    {
      "name": "Kerala",
      "type": "State",
      "children": [
        {
          "name": "",
          "type": "city"
        }
      ]
    },
    {
      "name": "Maharashtra",
      "type": "State",
      "children": [
        {
          "name": "Mumbai",
          "type": "city"
        },
        {
          "name": "Pune",
          "type": "city"
        }
      ]
    }
  ]
}

每个对象都有一个包含元素详细信息的子元素。我需要递归遍历 json 对象并删除所有 name 为空字符串的节点，直到根。对于上述 json 格式，输出应如下所示:

{
  "country": "India",
  "children": [
    {
      "name": "Karnataka",
      "type": "State",
      "children": [
        {
          "name": "Bangalore",
          "type": "city"
        },
        {
          "name": "Mangalore",
          "type": "city"
        }
      ]
    },
    {
      "name": "Kerala",
      "type": "State",
      "children": [
      ]
    },
    {
      "name": "Maharastra",
      "type": "State",
      "children": [
        {
          "name": "Mumbai",
          "type": "city"
        },
        {
          "name": "Pune",
          "type": "city"
        }
      ]
    }
  ]
}

如何使用 Underscorejs 在 javascript 中递归执行此操作。

Answer 1

这是 Array#filter() 的递归解决方案.

function filterName(a) {
    if (a.name) {
        if (Array.isArray(a.children)) {
            a.children = a.children.filter(filterName);
        }
        return true;
    }
}

var object = { "country": "India", "children": [{ "name": "Karnataka", "type": "State", "children": [{ "name": "", "type": "city" }, { "name": "Bangalore", "type": "city" }, { "name": "Mangalore", "type": "city" }] }, { "name": "Kerala", "type": "State", "children": [{ "name": "", "type": "city" }] }, { "name": "Maharashtra", "type": "State", "children": [{ "name": "Mumbai", "type": "city" }, { "name": "Pune", "type": "city" }] }] };

object.children.forEach(filterName);
document.write("<pre>" + JSON.stringify(object, 0, 4) + "</pre>");