Javascript - 过滤对象中的数组

Question

我正在尝试创建一个具有过滤值的对象数组

// desired output

     [
         { "2017-02-01": "09:00" },
         { "2017-02-02": "09:00" },
     ]

我的Js对象

let res = {
  "2018-02-01": [
    {
      "time": "09:00",
      "available": true,
    },
    {
      "time": "10:00",
      "available": false,
    }
  ],
  "2018-02-02": [
    {
      "time": "09:00",
      "available": true,
      "reference": null
    },
    {
      "time": "10:00",
      "available": false,
      "reference": null
    }
  ]
}

// My attempt 
output = _.keys(res).map( i => res[i].filter( t => t.available))

console.log(output); 

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>

Answer 1

试试这个:

let res = {
  "2018-02-01": [
    {
      time: "09:00",
      available: true
    },
    {
      time: "10:00",
      available: false
    }
  ],
  "2018-02-02": [
    {
      time: "09:00",
      available: true,
      reference: null
    },
    {
      time: "10:00",
      available: false,
      reference: null
    }
  ]
};
let output = Reflect.ownKeys(res).map(key => ({
  [key]: res[key].filter(obj => obj.available)[0].time
}));
console.log(output);

你的逻辑基本上是正确的，有一点错误，因为你没有很好地控制 map 函数中的 return value。

这就是我所做的:

[key]: /*basically  your code*/[0].time