javascript - 根据同级的现有属性将新属性添加到 javascript 对象中

Question

假设我有一个像这样的复杂对象数组:

[
  {
    "title": "Fundamentals",
    "order": 1,
    "lessonRef": "fundamentals",
    "children": [
      {
        "title": "History",
        "order": 1,
        "lessonRef": "history",
        "children": []
      },
      {
        "title": "NEW NODE 1",
        "lessonRef": "NEW NODE 1 STUB",
        "children": []
      },
      {
        "title": "Math",
        "order": 2,
        "lessonRef": "math",
        "children": []
      },
      {
        "title": "NEW NODE 2",
        "lessonRef": "NEW NODE 2 STUB",
        "children": []
      }
      {
        "title": "Geography",
        "order": 3,
        "lessonRef": "geography",
        "children": []
      }
    ]
  },
  {
    "title": "Basics",
    "order": 2,
    "lessonRef": "basics",
    "children": []
  }
]

我该怎么办:

1. 迭代每个节点，
2. 检测到存在一个没有 order 字段的新节点，并根据它在数组中的位置为其指定下一个数字，
3. 然后增加每个现有的同级，同时也
4. 考虑到其下面任何其他新添加的节点吗？

在我开始使用纯 JavaScript 之前，我正在寻找一种 lodash 方法来帮助我开始。

编辑:提供了我的解决方案——在我的例子中，数组顺序是有保证的，但我会将问题扩展到不保证顺序的情况。

Answer 1

如果这是你想做的:

var yourArray = yourDataArr
var arr1 = []


//fix children first
_.each(yourArray, function(item) {
    if(item.children) item.chilren = fixArr(children)
    arr1.push(item)
})


//fix your array
yourArray = fixArr(arr1)


//fix function
function fixArr(arr) {

    var res = []
    var prevOrder

    _.each(arr, function(item) {


        var currentOrder = item.order

        if(!currentOrder) {
            item.order =  prevOrder?prevOrder + 1:1
            prevOrder = item.order + 0
        }
        res.push(item)

    })

    return res

}

//or maybe this is you want
function fixArrAlt(arr) {

    var res = []
    var order = 1

    _.each(arr, function(item) {

        item.order =  order + 0
        res.push(item)
        order ++

    })

    return res

}