javascript - 更新集合中深层嵌套的对象

Question

我的结构如下 -

var a = {
  foo: {
    dates: {'2018-11-29': 2020.55},
    strategies: [
      {
        expiryDate: '2018-11-29',
        projects: [
          {
            expiryDate: '2018-11-29',
            name: 'foo',
            value: 500
          }
        ]
      }
    ]
  },
  bar: {
    dates: {'2018-11-29': 2020.55},
    strategies: [
      {
        expiryDate: '2018-11-29',
        projects: [
          {
            expiryDate: '2018-11-22',
            name: 'bar',
            value: 650
          },
          {
            expiryDate: '2018-11-22',
            name: 'mario',
            value: 700
          }
        ]
      }
    ]
  }
}

我正在尝试找出一种方法，能够使用 lodash 轻松更新内部 projects 集合。但我收到错误

我正在尝试做这样的事情

const finalTransformedData = _.mapValues(
  a,
  (value, key) => {
    value.strategies.map(strats =>
      strats.projects.map(trade =>
        Object.assign(
          {},
          { trade: 1 },
        ),
      ),
    );
  },
);

但我得到以下输出 - 我哪里出错了？

{ foo: undefined, bar: undefined }

上面的示例代码有点过于简单，但我正在寻找的是以某种方式轻松操作项目数组中的对象 - 本质上得到这样的东西 - 通过循环遍历数组中的对象并分配一个新的来替换数组中的对象对象(从object.assign获取)

foo: {
    dates: {'2018-11-29': 2020.55},
    strategies: [
      {
        expiryDate: '2018-11-29',
        projects: [
          {
            trade: 1
          }
        ]
      }
    ]
  },
  bar: {
    dates: {'2018-11-29': 2020.55},
    strategies: [
      {
        expiryDate: '2018-11-29',
        projects: [
          {
            trade: 1
          },
          {
            trade: 1
          }
        ]
      }
    ]
  }

Answer 1

没有lodash，你也可以尝试循环for..of

var a = {  foo: {    dates: {'2018-11-29': 2020.55},    strategies: [      {        expiryDate: '2018-11-29',        projects: [          {            expiryDate: '2018-11-29',            name: 'foo',            value: 500          }        ]      }    ]  },  bar: {    dates: {'2018-11-29': 2020.55},    strategies: [      {        expiryDate: '2018-11-29',        projects: [          {            expiryDate: '2018-11-22',            name: 'bar',            value: 650          },          {            expiryDate: '2018-11-22',            name: 'mario',            value: 700          }        ]      }    ]  }}

for(let { strategies } of Object.values(a)) {
  for(let s of strategies) {
    s.projects = s.projects.map(d => ({ trade: 1 }))
  }
}

console.log(a)