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按ISOString日期对JavaScript嵌套对象排序

object date javascript

-1

Liz Parody · 技术社区 · 6 年前

我有这个对象,我想返回一个按升序日期排序的新对象,考虑到startTime是一个ISOString。(我也在使用moment)我该怎么做?

const clinics = {
  "a0CW00000027OX3MAM": {
    "id": "a0CW00000027OX3MAM",
    "companyName": "Hendrick Medical Center",
    "startTime": "2018-08-10T05:30:00.000Z",
  },
  "a0CW00000026gjJMAQ": {
    "id": "a0CW00000026gjJMAQ",
    "companyName": "ABC Manufacturing",
    "startTime": "2018-08-10T10:36:00.000Z",
  },
  "a0CW00000026gipMAA": {
    "id": "a0CW00000026gipMAA",
    "companyName": "ABC Manufacturing",
    "startTime": "2018-08-01T10:36:00.000Z",
  }
}

2 回复 | 直到 6 年前

fubar 6 年前

以下将按开始时间按升序对诊所进行排序。

它首先使用 Object.values() .
这些值按升序排序,使用 Array.prototype.sort() .
最后,使用 Array.prototype.reduce() .

const clinics = {
  "a0CW00000027OX3MAM": {
    "id": "a0CW00000027OX3MAM",
    "companyName": "Hendrick Medical Center",
    "startTime": "2018-08-10T05:30:00.000Z",
  },
  "a0CW00000026gjJMAQ": {
    "id": "a0CW00000026gjJMAQ",
    "companyName": "ABC Manufacturing",
    "startTime": "2018-08-10T10:36:00.000Z",
  },
  "a0CW00000026gipMAA": {
    "id": "a0CW00000026gipMAA",
    "companyName": "ABC Manufacturing",
    "startTime": "2018-08-01T10:36:00.000Z",
  }
};

const sorted = Object.values(clinics)
  .sort((a, b) => a.startTime > b.startTime)
  .reduce((m, c) => m.set(c.id, c), new Map());

for (let [key, value] of sorted.entries()) {
  console.log(key, value);
}

编辑 -答案更新为使用 Map ,以保证财产秩序。

Adam H 6 年前

好吧,你的对象不是一个数组,所以如果不先将它转换成一个数组,你就不能对它进行真正的排序。下面是一个将其转换为数组,然后仅使用字段文本进行排序的示例,因为ISO会以这种方式进行很好的排序。

编辑我更新了它以添加一个函数将其转换回对象

const clinics = {
  "a0CW00000027OX3MAM": {
    "id": "a0CW00000027OX3MAM",
    "companyName": "Hendrick Medical Center",
    "startTime": "2018-08-10T05:30:00.000Z",
  },
  "a0CW00000026gjJMAQ": {
    "id": "a0CW00000026gjJMAQ",
    "companyName": "ABC Manufacturing",
    "startTime": "2018-08-10T10:36:00.000Z",
  },
  "a0CW00000026gipMAA": {
    "id": "a0CW00000026gipMAA",
    "companyName": "ABC Manufacturing",
    "startTime": "2018-08-01T10:36:00.000Z",
  }
}

function compare(a,b) {
  if (a.startTime < b.startTime)
     return -1;
  if (a.startTime > b.startTime)
    return 1;
  return 0;
}

function objectToArray(obj){
	var keys = Object.keys(obj);
  var ret = [];
  for (var i = 0; i < keys.length; i++)
  	ret.push(obj[keys[i]]);
    
  return ret;
}

function arrayToObject(arr){
	var ret = {};
  for(var i = 0; i < arr.length; i++)
    ret[arr[i].id] = arr[i];
  return ret;
}

var arr = objectToArray(clinics);
console.log(arr.sort(compare));
console.log(arrayToObject(arr));