groupBy 与 Lodash 模块

groupBy with Lodash module(groupBy 与 Lodash 模块)

问题描述

我使用 lodash 模块进行了如下分组:

I have grouped using the lodash module as below:

export class DtoTransactionCategory {
    categoryName: String;
    totalPrice: number;
}

分组方式

import { groupBy} from 'lodash';

  let result = groupBy(transactionCategoryList, (c: DtoTransactionCategory) => {
      return c.categoryName
    });

结果:

所以现在我需要像这样得到上面的数组(即totalPrice是group的sum):

So now I need to get the above array like this (i.e. totalPrice is the sum of the group):

let myNewArry = [{categoryName:"cat1",totalPrice: 9400},
                    {categoryName:"cat2",totalPrice: 600}]

你能告诉我如何实现最后一步吗?我在这里使用 Lodash 模块.

Can you tell me how to achieve last step? I'm using Lodash modules here.

推荐答案

let result = {
cat1: [{totalPrice: 2}, {totalPrice: 3}],
cat2: [{totalPrice: 2}, {totalPrice: 5}]
}
const totals = _.map(result, (val, key) => ({categoryName: key, totalPrice: _.sumBy(val, 'totalPrice')}))

console.log(totals)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

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