按数组分组并在主数组中添加字段和子数组 [英] Group by array and add field and sub array in main array

问题描述

我有一个像这样的重数组:

<预><代码>[{Id: 1, Name: 'Red', optionName: 'Color'},{Id: 2, Name: 'Yellow', optionName: 'Color'},{Id: 3, Name: 'Blue', optionName: 'Color'},{Id: 4, Name: 'Green', optionName: 'Color'},{Id: 7, Name: 'Black', optionName: 'Color'},{Id: 8, Name: 'S', optionName: 'Size'},{Id: 11, Name: 'M', optionName: 'Size'},{Id: 12, Name: 'L', optionName: 'Size'},{Id: 13, Name: 'XL', optionName: 'Size'},{Id: 14, Name: 'XXL', optionName: 'Size'}]

我需要做的是将它们按 optionName 分组，并在主数组中有两行，如下所示:

<预><代码>[{名称: '颜色',数据:[{Id:1，名称:'红色'}，{Id:2，名称:'黄色'}，{Id: 3, Name: 'Blue'},{Id:4，名称:'绿色'}，{ID:7，名称:'黑色'}]}, {名称: '尺寸',数据:[{Id:8，名称:'S'}，{ID:11，名称:'M'}，{ID:12，名称:'L'}，{ID:13，名称:'XL'}，{ID:14，名称:'XXL'}]}]

如何在javascript中做到这一点?

解决方案

这是我为这些情况写的一个片段.您可以将此功能添加到您的所有数组中:

Object.defineProperty(Array.prototype, 'group', {可枚举:假，值:功能(键){无功映射 = {};this.forEach(function (e) {var k = key(e);地图[k] = 地图[k] ||[];地图[k].push(e);});返回 Object.keys(map).map(function (k) {返回 {key: k, data: map[k]};});}});

你可以这样使用它.您可以只传递一个函数来定义您希望如何对数据进行分组.

var newArray = arr.group(function (item) {返回 item.optionName;});

工作小提琴

如果需要，可以将 {key: k, data: map[k]} 替换为 {Name: k, Data: map[k]}.

<小时>

这也是上面代码的更紧凑的ES6版本:

Object.defineProperty(Array.prototype, 'group', {可枚举:假，值:功能(键){让地图 = {};this.map(e => ({k: key(e), d: e})).forEach(e => {地图[e.k] = 地图[e.k] ||[];地图[e.k].push(e.d);});return Object.keys(map).map(k => ({key: k, data: map[k]}));}});

像这样使用它:

let newArray = arr.group(item => item.optionName))

I have a heavy array like this:

[
  {Id: 1, Name: 'Red', optionName: 'Color'}, 
  {Id: 2, Name: 'Yellow', optionName: 'Color'},
  {Id: 3, Name: 'Blue', optionName: 'Color'},
  {Id: 4, Name: 'Green', optionName: 'Color'},
  {Id: 7, Name: 'Black', optionName: 'Color'},
  {Id: 8, Name: 'S', optionName: 'Size'},
  {Id: 11, Name: 'M', optionName: 'Size'},
  {Id: 12, Name: 'L', optionName: 'Size'},
  {Id: 13, Name: 'XL', optionName: 'Size'},
  {Id: 14, Name: 'XXL', optionName: 'Size'}
]

What I need to do is to group them by optionName and have two row in the main array like this:

[
  {
    Name: 'Color',
    Data:[{Id: 1, Name: 'Red'},
          {Id: 2, Name: 'Yellow'},
          {Id: 3, Name: 'Blue'},
          {Id: 4, Name: 'Green'},
          {Id: 7, Name: 'Black'}]
  }, {
    Name: 'Size',
    Data:[{Id: 8, Name: 'S'},
          {Id: 11, Name: 'M'},
          {Id: 12, Name: 'L'},
          {Id: 13, Name: 'XL'},
          {Id: 14, Name: 'XXL'}]
  }
]

How to do it in javascript?

解决方案

This is a snippet I wrote for these kind of situations. You can add this functionality to all of your arrays:

Object.defineProperty(Array.prototype, 'group', {
  enumerable: false,
  value: function (key) {
    var map = {};
    this.forEach(function (e) {
      var k = key(e);
      map[k] = map[k] || [];
      map[k].push(e);
    });
    return Object.keys(map).map(function (k) {
      return {key: k, data: map[k]};
    });
  }
});

You can use it like this. You can just pass a function which defines how you want to group your data.

var newArray = arr.group(function (item) {
  return item.optionName;
});

Working Fiddle

If you need, you can replace {key: k, data: map[k]} with {Name: k, Data: map[k]}.

---

This is also more compact ES6 version of the code above:

Object.defineProperty(Array.prototype, 'group', {
  enumerable: false,
  value: function (key) {
    let map = {};
    this.map(e => ({k: key(e), d: e})).forEach(e => {
      map[e.k] = map[e.k] || [];
      map[e.k].push(e.d);
    });
    return Object.keys(map).map(k => ({key: k, data: map[k]}));
  }
});

Use it like this:

let newArray = arr.group(item => item.optionName))

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