如何根据反应js中的两个条件显示元素总数？

Question

我试图根据两个条件显示参与者总数："Nume": "4S110" 和 "Nume": "Contabilitate" 来自 INDICATORI 数组和 Cursuri 数组。

将它们显示为

const cont = popular.reduce((total, participant) => total + participant.Cursuri
  .filter(curs => curs.Nume === "Contabilitate") && participant.INDICATORI
  .filter(indicator => indicator.Nume === "4S110").length,0)

output is : 0, it should be 1


api is:

```
"rows": [
   {
     "id": "15f806ec-79cf-498f-8a4d-8bc8fdf8c43e",
     "Nume": "negrea",
     "Prenume": "ioana",
     "Varsta": 40,
     "createdAt": "2022-04-27T13:17:05.000Z",
     "updatedAt": "2022-04-27T13:17:05.000Z",
     "deletedAt": null,
     "INDICATORI": [
       {
         "id": "068170b3-7995-41df-8fac-4f2bc577e2c6",
         "Nume": "4S110",
         "importHash": null,
         
       }
     ],
     "Cursuri": [{
         "id": "068170b3-7995-41df-8fac-4f2bc577e2c6",
         "Nume": "Contabilitate",
         "importHash": null,
         ]
   },

Answer 1

.filter()函数returns一个数组所以需要添加.length。 Math.min() 如果您只想对这样的人计数一次（必须在两项中都有一个条目），可以提供帮助。

let popular = JSON.parse(`[
   {
     "id": "15f806ec-79cf-498f-8a4d-8bc8fdf8c43e",
     "Nume": "negrea",
     "Prenume": "ioana",
     "Varsta": 40,
     "createdAt": "2022-04-27T13:17:05.000Z",
     "updatedAt": "2022-04-27T13:17:05.000Z",
     "deletedAt": null,
     "INDICATORI": [
       {
         "id": "068170b3-7995-41df-8fac-4f2bc577e2c6",
         "Nume": "4S110",
         "importHash": null         
       }
     ],
     "Cursuri": [{
         "id": "068170b3-7995-41df-8fac-4f2bc577e2c6",
         "Nume": "Contabilitate",
         "importHash": null
         }]
   }]`);
   

 
 const count = popular.reduce((total, participant) => total + Math.min(participant.Cursuri
  .filter(indicator => indicator.Nume === "Contabilitate").length, participant.INDICATORI
  .filter(indicator => indicator.Nume === "4S110").length), 0)

 console.log(count);

如何根据反应js中的两个条件显示元素总数？

How to show total count of elements based on two conditions in react js?

arrays

reactjs

object

filter

reduce