How to return object that matches using es6 map?

Question

trying to use es6 map method so below i am trying to get object from cacheDetails function that matches with the key but it also returns some undefined values, what is implemented wrong in below code any help would be appreciated ?

main.js

var uniqueCacheKeys = [{key:"14556459709"},{key:"1457099"}];
var rxInfos = [];
function getCahce(data){
  data.forEach(function(el){
    var rxInfo = cacheDetails(el.key);
    if(rxInfo){
      rxInfos.push(rxInfo);
    } 
  });
}
function cacheDetails(key){
  var mapObj;
   var rxInfos = [
      {
            "drugNdc": "10101",
            "rxNumber": "14556459709",
            "firstFillIndicator": "N",
            "sourceSystem": "TBS",
            "indexID": "RPT0ifQ",
            "ancilary": true
        },{
            "drugNdc": "10101",
            "rxNumber": "145709",
            "firstFillIndicator": "N",
            "sourceSystem": "TBS",
            "indexID": "RPT0ifQ",
            "ancilary": true
        }];
  mapObj = rxInfos.map(function (task, index, array) {
   if(task.rxNumber === key){
        return task; 
   }
});

  return mapObj;
}
getCahce(uniqueCacheKeys);

console.log(rxInfos);

output

[[[object Object] {
  ancilary: true,
  drugNdc: "10101",
  firstFillIndicator: "N",
  indexID: "RPT0ifQ",
  rxNumber: "14556459709",
  sourceSystem: "TBS"
}, undefined], [undefined, undefined]]

desired ouput with above data

[{
  ancilary: true,
  drugNdc: "10101",
  firstFillIndicator: "N",
  indexID: "RPT0ifQ",
  rxNumber: "14556459709",
  sourceSystem: "TBS"
}]

`Array.prototype.map` is ES5 (the es6 feature is a `Map`, which behaves similarly to an object) — CertainPerformance, Dec 31 '18 at 03:03
Your `.map` function is only sometimes returning values - when it doesn't, you get `undefined`. Use `filter` instead of `map` — CertainPerformance, Dec 31 '18 at 03:06
@CertainPerformance i wanted to return object {} filter returns array — hussain, Dec 31 '18 at 03:07
desired output would be if any object keys matched push that object to rxInfos array. — hussain, Dec 31 '18 at 03:09
Please explain better, that doesn't make much sense by itself - post the desired data structure in your question — CertainPerformance, Dec 31 '18 at 03:12
Use `filter`, as in the linked question, then because `cacheDetails` will return an array, check `if(rxInfo.length){` instead of `if(rxInfo){`, and spread into `rxInfos` — CertainPerformance, Dec 31 '18 at 03:17
`.map` only makes sense when you want to construct a new array from *every element* of another. If you want to *pick particular elements* from one array to construct another, use `filter` — CertainPerformance, Dec 31 '18 at 03:18

How to return object that matches using es6 map?

0 Answers0