我正在写一小段JS代码,它有一个数组：

[
 { title: 'title1', id: 1 },
 { title: 'title1', id: 2 },
 { title: 'title2', id: 3},
 { title: 'title2', id: 4}
]

我需要这样的东西：

"queried": {
    "title1": [1, 2],
    "title2": [3, 4],
 }

我试图用Lodash和_.groupBy(数组,“标题”)这样做,但我得到：

{ 
 title1:[
  { title: 'title1', id: 1 },
  { title: 'title1', id: 2 }
],
 title2:[
  { title: 'title2', id: 3 },
  { title: 'title2', id: 4 }
],
}

请问如何解决？

解决方法:

使用_.mapValues()迭代组,使用_.map()提取id的值：

const lol = [{"title":"title1","id":1},{"title":"title1","id":2},{"title":"title2","id":3},{"title":"title2","id":4}];
  
const result = _.mapValues(
  _.groupBy(lol, 'title'),
  v => _.map(v, 'id')
);

console.log(result);

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