javascript - 使用 lodash 创建父子关系

Question

根据索引值组合父级和子级 JSON 数组，并向其中添加另一个找到的属性。

数据:比较字段:ParentJSON - 索引childJSON -parent_index

输出:- 家长- 及其 child - 家长- 及其子元素

parentJSON:
[{ index:1, name: 'a'}, {index:2, name: 'b'}, {index:3, name: 'c'}, {index:4, name: 'd'}]

childJSON:
[
  { index:1, name: 'aa', parent_index:1}, 
  {index:2, name: 'ab', parent_index:1}, 
  {index:3, name: 'ba', parent_index: 2}, 
  {index:4, name: 'bb', parent_index: 2}, 
  {index:5, name: 'ca', parent_index: 3}, 
  {index:6, name: 'ad', parent_index: 1}
]

output:
[
  { index:1, name: 'a'},
  { index:1, name: 'aa', parent_index:1, found: true}, 
  { index:2, name: 'ab', parent_index:1, found: true},
  { index:6, name: 'ad', parent_index:1, found: true},
  { index:2, name: 'b'},
  { index:3, name: 'ba', parent_index:2, found: true}, 
  { index:4, name: 'bb', parent_index:2, found: true},
  { index:3, name: 'c'},
  { index:5, name: 'ca', parent_index:3, found: true},
  { index:4, name: 'd'},
]

Plunker Link

Answer 1

由于您正在使用 lodash ，将使我的解决方案全部包含在 lodash 中。

解决这个问题的步骤是:

1. 是映射childJSON，检查其parent的索引是否存在

2. 将两个 json 数组合并为一个。

3. 按名称升序对它们进行排序。

将其写入代码将是:

var childJSON = [
  { index:1, name: 'aa', parent_index:1}, 
  {index:2, name: 'ab', parent_index:1}, 
  {index:3, name: 'ba', parent_index: 2}, 
  {index:4, name: 'bb', parent_index: 2}, 
  {index:5, name: 'ca', parent_index: 3}, 
  {index:6, name: 'ad', parent_index: 1}
];

var parentJSON = [
   { index:1, name: 'a'},
   {index:2, name: 'b'}, 
   {index:3, name: 'c'}, 
   {index:4, name: 'd'}
   ];


childJSON = _.map(childJSON, function(child) {
    child.found = !!_.find(parentJSON, {index: child.parent_index});
    return child;
});

var newArray = _.concat(childJSON, parentJSON);
newArray = _.sortBy(newArray, ['name']);

console.log(newArray);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.js"></script>