打字稿：如何按字段名称对命名对象列表的对象进行分组

Question

我必须使用 javascript 这种美妙的语言来处理数据。在那之前，我设法靠自己实现了我所需要的，但我在那里达到了我的极限。

很难解释我的数据是如何构建的，所以让我们做一个架构。这就是我的 :

    obj: {[key: string]: {name: string, type: string}[]} = 
    {
        "animals": [
          {name: "Louis", type: "dog"},
          {name: "John", type: "cat"},
          {name: "Jordan", type: "dog"},
        ]
        "cars" : [
          {name: "alpha", type: "ferrari"},
          {name: "beta", type: "ferrari"},
          {name: "charlie", type: "mercedes"},
        ]
     }

我尝试实现的是针对每个对象，按类型对列表中的对象进行分组。这看起来像这样：

obj: {[key: string]: {[key: string]: {name: string, type: string}[]}} = 
{
    "animals": {
      "dog": [
          {name: "Louis", type: "dog"},
          {name: "Jordan", type: "dog"},
      ],
      "cat": [
          {name: "John", type: "cat"},
      ]
    }
    "cars" : {
      "ferrari": [
          {name: "alpha", type: "ferrari"},
          {name: "beta", type: "ferrari"},
      ],
      "mercedes": [
          {name: "charlie", type: "mercedes"},   
      ]
    }
 }

你知道如何实现吗？

Answer 1

我认为您正在寻找以下内容（因为您的问题标题中有 TypeScript）：

interface Value {
  name: string;
  type: string;
}

type Categorized = {
  [index: string]: Record<string, Value[]>;
};

const results = Object.entries(obj).reduce<Categorized>((mapping, [key, values]) => {
  const group: Record<string, Value[]> = {};

  for (const value of values) {
    if (group[value.type] === undefined) {
      group[value.type] = [value];
    } else {
      group[value.type].push(value);
    }
  }

  return {
    ...mapping,
    [key]: group,
  };
}, {});

打字稿：如何按字段名称对命名对象列表的对象进行分组

Typescript : How to group an object of named list of objects by field name

javascript

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structure

data-structures

typescript