javascript - 如何根据条件从数组中删除重复元素？

Question

如果有多个消息且元素“settlementDesc”不包含未覆盖或无效数量，则尝试编写逻辑，反之亦然。我应该能够使用 notCovered/invalidQuantity 字符串删除重复项并保留。

数据

All these scenarios should be if messages are more then 1 in length 
Scenario#1 

    const messages = [

              {

                "settlementCode": "58",

                "settlementDesc": "Not Covered Needs prior authorization: System could not process your request. Call us at the toll-free number on your benefit ID card."

              },

              {

                "settlementCode": "58",

                "settlementDesc": "Not Covered Needs prior authorization: System could not process your request. Call us at the toll-free number on your benefit ID card."

              },

              {

                "settlementCode": "359",

                "settlementDesc": "Needs prior authorization: System could not process your request. Call us at the toll-free number on your benefit ID card."

              }

            ];

Scenario#2 

 const messages = [

              {

                "settlementCode": "58",

                "settlementDesc": "Not Covered Needs prior authorization: System could not process your request. Call us at the toll-free number on your benefit ID card."

              },

              {

                "settlementCode": "58",

                "settlementDesc": "Not Covered Needs prior authorization: System could not process your request. Call us at the toll-free number on your benefit ID card."

              }

            ];

main.js

const validateEntries = (messages) => {
  let filteredMsg;
  if (!messages) {
    return [];
  }
if(messages.length > 1) {
  console.log("Multiple messages");
  const response = [];
  let bRet = false;
  const mulitpleMessages = messages.reduce((acc,curr) => {
    if (/not covered|invalid quantity/i.test(curr.settlementDesc !== true) {
      bRet = true;
    }
    if(bRet) {
      if( acc.settlementCode == curr.settlementCode) {
        return acc;
      }
    }
    return curr;
  });
  filteredMsg = mulitpleMessages;
} else {
  filteredMsg = messages.filter((item) => {
    if (/not covered|invalid quantity/i.test(item.settlementDesc)) {
      return true;
    } else {
      return item.settlementDesc.includes(':');
    }
  });
}

  return filteredMsg;
};

console.log(validateEntries(messages));

预期输出

Scneario#1 ouput 

    [


                  {

                    "settlementCode": "359",

                    "settlementDesc": "Needs prior authorization: System could not process your request. Call us at the toll-free number on your benefit ID card."

                  }

                ];

Scenario#2 

[

              {

                "settlementCode": "58",

                "settlementDesc": "Not Covered Needs prior authorization: System could not process your request. Call us at the toll-free number on your benefit ID card."

              }]

错误

let bRet = false;
  38 |   const mulitpleMessages = messages.reduce((acc,curr) => {
> 39 |     if (/not covered|invalid quantity/i.test(curr.settlementDesc !== true) {
     |                                                                           
  41 |       bRet = true;
  42 |     }

Answer 1

您可以使用嵌套的filter()

const messages = [ { "settlementCode": "58", "settlementDesc": "Not Covered Needs prior authorization: System could not process your request. Call us at the toll-free number on your benefit ID card." }, { "settlementCode": "58", "settlementDesc": "Not Covered Needs prior authorization: System could not process your request. Call us at the toll-free number on your benefit ID card." }, { "settlementCode": "359", "settlementDesc": "Needs prior authorization: System could not process your request. Call us at the toll-free number on your benefit ID card." } ];

const res = messages.filter(x => 
               messages.filter(a => a.settlementCode === x.settlementCode).length === 1
            );

console.log(res)