reactjs - 为 react 中的过滤器带来最大数据记录

Question

我有一个 JSON 对象，任何用户都可以在其中提交应用程序，并且可以由任何用户操作。应用程序获得批准后，我需要显示最大日期“建议”和最大日期“已批准”。我的 JSON 对象是

var histData = [{
     "EXECUTION_STATE_CODE":"PROPOSED",
     "EXECUTION_BY":"User1",
     "EVENT_ID":4893664,
     "CREATED_ON":"2020-09-25T18:57:33.000Z",
    },
    {
     "EXECUTION_STATE_CODE":"REJECTED",
     "EXECUTION_BY":"ADMINUser1",
     "EVENT_ID":4893665,
     "CREATED_ON":"2020-09-25T19:57:33.000Z",
    },
    {
     "EXECUTION_STATE_CODE":"MODIFIED",
     "EXECUTION_BY":"User12",
     "EVENT_ID":4893669,
     "CREATED_ON":"2020-09-25T20:12:33.000Z",
    },
    {
     "EXECUTION_STATE_CODE":"PROPOSED",
     "EXECUTION_BY":"User12",
     "EVENT_ID":4893670,
     "CREATED_ON":"2020-09-25T20:32:33.000Z",
    },
    {
     "EXECUTION_STATE_CODE":"APPROVED",
     "EXECUTION_BY":"ADMINUser22",
     "EVENT_ID":4893672,
     "CREATED_ON":"2020-09-25T18:57:33.000Z",
    }];

我试过的代码如下但不起作用。

let var1 = new Date(Math.max.apply(null, histData.map(function(e) {
  console.log("object", e)
  if(e.EXECUTION_STATE_CODE==="PROPOSED"){

  return e.EXECUTED_ON;
}

预期结果是

Application 
Proposer : User12 
Approved : AdminUser22

请帮忙

Answer 1

考虑到您有对象数组，我将其命名为 histData

var histData = [{
     "EXECUTION_STATE_CODE":"PROPOSED",
     "EXECUTION_BY":"User1",
     "EVENT_ID":4893664,
     "CREATED_ON":"2020-09-25T18:57:33.000Z",
    },
    {
     "EXECUTION_STATE_CODE":"REJECTED",
     "EXECUTION_BY":"ADMINUser1",
     "EVENT_ID":4893665,
     "CREATED_ON":"2020-09-25T19:57:33.000Z",
    },
    {
     "EXECUTION_STATE_CODE":"MODIFIED",
     "EXECUTION_BY":"User12",
     "EVENT_ID":4893669,
     "CREATED_ON":"2020-09-25T20:12:33.000Z",
    },
    {
     "EXECUTION_STATE_CODE":"PROPOSED",
     "EXECUTION_BY":"User12",
     "EVENT_ID":4893670,
     "CREATED_ON":"2020-09-25T20:32:33.000Z",
    },
    {
     "EXECUTION_STATE_CODE":"APPROVED",
     "EXECUTION_BY":"ADMINUser22",
     "EVENT_ID":4893672,
     "CREATED_ON":"2020-09-25T18:57:33.000Z",
    }];
 


var maxPropsed = histData.filter(h => h.EXECUTION_STATE_CODE==="PROPOSED").reduce((a, b) => {
    return new Date(a.CREATED_ON) > new Date(b.CREATED_ON) ? a : b;
 },{}).EXECUTION_BY;

var maxApproved = histData.filter(h => h.EXECUTION_STATE_CODE==="APPROVED").reduce((a, b) => {
    return new Date(a.CREATED_ON) > new Date(b.CREATED_ON) ? a : b;
 },{}).EXECUTION_BY;
 
 
 

    var histData = [{
         "EXECUTION_STATE_CODE":"PROPOSED",
         "EXECUTION_BY":"User1",
         "EVENT_ID":4893664,
         "CREATED_ON":"2020-09-25T18:57:33.000Z",
        },
        {
         "EXECUTION_STATE_CODE":"REJECTED",
         "EXECUTION_BY":"ADMINUser1",
         "EVENT_ID":4893665,
         "CREATED_ON":"2020-09-25T19:57:33.000Z",
        },
        {
         "EXECUTION_STATE_CODE":"MODIFIED",
         "EXECUTION_BY":"User12",
         "EVENT_ID":4893669,
         "CREATED_ON":"2020-09-25T20:12:33.000Z",
        },
        {
         "EXECUTION_STATE_CODE":"PROPOSED",
         "EXECUTION_BY":"User12",
         "EVENT_ID":4893670,
         "CREATED_ON":"2020-09-25T20:32:33.000Z",
        },
        {
         "EXECUTION_STATE_CODE":"APPROVED",
         "EXECUTION_BY":"ADMINUser22",
         "EVENT_ID":4893672,
         "CREATED_ON":"2020-09-25T18:57:33.000Z",
        }];
     
 

    var maxPropsed = histData.filter(h => h.EXECUTION_STATE_CODE==="PROPOSED").reduce((a, b) => {
        return new Date(a.CREATED_ON) > new Date(b.CREATED_ON) ? a : b;
     },{}).EXECUTION_BY;
    
    var maxApproved = histData.filter(h => h.EXECUTION_STATE_CODE==="APPROVED").reduce((a, b) => {
        return new Date(a.CREATED_ON) > new Date(b.CREATED_ON) ? a : b;
     },{}).EXECUTION_BY;
     
     
     console.log("maxPropsed: ", maxPropsed);
     
     console.log("maxApproved:",  maxApproved);