filter missing array objects using lodash

Question

In my angular 4 application I have the following array :

let sampleArray1 = [
  {
    "name":"Raman",
    "prdList":[
      {
        "p_code":"20",
        "crtList":[
          {
            "c_code":"087"
          }
        ]
      }
    ]
  },
  {
    "name":"Laxman",
    "prdList":[
      {
        "p_code":"10"
      }
    ]
  },
  {
    "name":"raj",
    "prdList":[
      {
        "p_code":"202"
      }
    ]
  },
  {
    "name":"raghav",
    "prdList":[
      {
        "p_code":"30",
        "crtList":[
          {
            "c_code":"97"
          }
        ]
      }
    ]
  }
]

In this array some of the objects are missing crtList. I need to filter out all such objects and need to have the array which must and should has crtList.

So my result sampleArray2 should have the following result :

 [
      {
        "name":"Raman",
        "prdList":[
          {
            "p_code":"20",
            "crtList":[
              {
                "c_code":"087"
              }
            ]
          }
        ]
      },
      {
        "name":"raghav",
        "prdList":[
          {
            "p_code":"30",
            "crtList":[
              {
                "c_code":"97"
              }
            ]
          }
        ]

} ]

How can I achieve this using lodash?

If you want to be able to do this sort of manipulation on your own, without asking for help, learn how to here. — evolutionxbox
– evolutionxbox, Commented Jul 3, 2017 at 10:09
@evolutionxbox Very useful link. I learnt data transformation and functional JS programming myself from the same place. — abhishekkannojia
– abhishekkannojia, Commented Jul 3, 2017 at 10:17

shaochuancs · Accepted Answer · 2017-07-03 10:12:29Z

Actually, to get sampleArray2, you don't need lodash. A simple Array.prototype.filter is enough:

let sampleArray1 = [
  {
    "name":"Raman",
    "prdList":[
      {
        "p_code":"20",
        "crtList":[
          {
            "c_code":"087"
          }
        ]
      }
    ]
  },
  {
    "name":"Laxman",
    "prdList":[
      {
        "p_code":"10"
      }
    ]
  },
  {
    "name":"raj",
    "prdList":[
      {
        "p_code":"202"
      }
    ]
  },
  {
    "name":"raghav",
    "prdList":[
      {
        "p_code":"30",
        "crtList":[
          {
            "c_code":"97"
          }
        ]
      }
    ]
  }
];

let result = sampleArray1.filter(function(x) {
  return hasCrtList(x.prdList);
});

function hasCrtList(prdList) {
  for (var i in prdList) {
    if (prdList[i].crtList) {
      return true;
    }
  }
  return false;
}

console.log(result);

Pakpoom Tiwakornkit · Accepted Answer · 2019-06-12 05:49:18Z

0

I know it's a bit too late, but I think it's useful for other developers. You can achieve this easily in just one line of code using Lodash.

_.differenceWith(fullArrayOfObjects, subsetArrayOfObjects, _.isEqual)

This function will return missing array of objects that is not in subsetArrayOfObjects. Hope it helps.

answered Jun 12, 2019 at 5:49

Pakpoom Tiwakornkit

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