groupBy与Lodash模块 [英] groupBy with Lodash module
本文介绍了groupBy与Lodash模块的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我使用lodash模块分组如下:
export class DtoTransactionCategory {
categoryName:String;
totalPrice:number;
}
groupBy
从'lodash'导入{groupBy};
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
是组
的总和
:
让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
。
解决方案
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 /库/ lodash.js / 4.17.4 / lodash.min.js>< /脚本>
I have grouped using the lodash module as below:
export class DtoTransactionCategory {
categoryName: String;
totalPrice: number;
}
groupBy
import { groupBy} from 'lodash';
let result = groupBy(transactionCategoryList, (c: DtoTransactionCategory) => {
return c.categoryName
});
Result:
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}]
Can you tell me how to achieve last step? I'm using Lodash modules
here.
解决方案
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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