How to filter nested array using Lodash?

Question

This is my Array (http://www.jsoneditoronline.org/?id=cc51a12581667055781639b586fa6e15):

[
  {
    "documents": [
      {
        "name": "a",
        "isSelected": true,
        "status": "good"
      },
      {
        "name": "b",
        "isSelected": false,
        "status": "good"
      }
    ]
  },
  {
    "documents": [
      {
        "name": "a",
        "isSelected": true,
        "status": "bad"
      },
      {
        "name": "b",
        "isSelected": false,
        "status": "good"
      }
    ]
  },
  {
    "documents": [
      {
        "name": "a",
        "isSelected": true,
        "status": "verygood"
      },
      {
        "name": "b",
        "isSelected": false,
        "status": "good"
      }
    ]
  },
  {
    "documents": [
      {
        "name": "a",
        "isSelected": false,
        "status": "good"
      },
      {
        "name": "b",
        "isSelected": false,
        "status": "good"
      }
    ]
  }
]

I need to write condition using _.lodash. This condition has to return TRUE if in array is at least one Selected document with Status other than good or verygood

Based on array from above. http://prnt.sc/de3gx9 You can see on the screenshot that in array is an object with:

isSelected
Has other status than good or verygood

If in my Array is at least one object (with isSelected = true, and status = bad (or any other than good or verygood). Then I want to see RESULT: TRUE

 function checkStatusInArray() {   
       var data = [....]; // this is my array

       var isDocumentSelectedWithWrongStatus = _.some(data, { isSelected: true, status: !"good" || !"verygood" });
       // So if in array are some items with isSelected = true and status != good || verygood, then isDocumentSelectedWithWrongStatus = TRUE

       return isDocumentSelectedWithWrongStatus; 
    }

I added filter, because I thought that gonna be easier with less number of objects — DiPix
– DiPix, Commented Dec 1, 2016 at 15:09
I want to see only bool reasult. If there will be item with isSelected = true and status = bad, worst, badly or any except: good or verygood. — DiPix
– DiPix, Commented Dec 1, 2016 at 16:00

Ori Drori · Accepted Answer · 2016-12-01 17:03:52Z

2

You can do it without lodash - Array#some inside Array#some and a predicate (the predicate can be inlined as anonymous function), if the predicate returns, the result will be truthy:

function checkData(data, predicate) {
  return data.some(function(item) {
    return item.documents.some(predicate);
  });
}

function predicate(document) {
  return document.isSelected && 
    !(document.status === 'good' ||
    document.status === 'verygood');
}

function checkData(data, predicate) {
  return data.some(function(item) {
    return item.documents.some(predicate);
  });
}

function predicate(document) {
  return document.isSelected && 
    !(document.status === 'good' ||
    document.status === 'verygood');
}

var data = [{
  "documents": [{
    "name": "a",
    "isSelected": true,
    "status": "good"
  }, {
    "name": "b",
    "isSelected": false,
    "status": "good"
  }]
}, {
  "documents": [{
    "name": "a",
    "isSelected": true,
    "status": "bad"
  }, {
    "name": "b",
    "isSelected": false,
    "status": "good"
  }]
}, {
  "documents": [{
    "name": "a",
    "isSelected": true,
    "status": "verygood"
  }, {
    "name": "b",
    "isSelected": false,
    "status": "good"
  }]
}, {
  "documents": [{
    "name": "a",
    "isSelected": false,
    "status": "good"
  }, {
    "name": "b",
    "isSelected": false,
    "status": "good"
  }]
}];

var result = checkData(data, predicate);

console.log(result);

edited Dec 1, 2016 at 17:03

answered Dec 1, 2016 at 15:07

Ori Drori

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4 Comments

DiPix Over a year ago

Are you sure that is correctly? It seems that it doesn't work properly.

DiPix Over a year ago

Well when I was trying to use it in this way: var b = deepFilter(data, predicate); where data = my array, then this function deepFilter assigned to var b all arrays.

DiPix Over a year ago

Code snippet returns 3 objects. I wanted to check whether in Data is selected document with status other than good or verygood. If there is at least one. I wanted to see TRUE. Nothing more.

DiPix Over a year ago

Maybe this filter was a bad approach. Anyway this filter return me objects where isSelected=true So only first 3 records of Array in this case. However it give me nothing. Because there are still documents with status other than good or verygood. I'll try to explain you in edit.

Rajesh Dixit · Accepted Answer · 2016-12-02 06:41:12Z

You could use lodash's flatMap to pluck the documents into one collection and then use some on the collection:

var data = [{"documents":[{"name":"a","isSelected":true,"status":"good"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":true,"status":"bad"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":true,"status":"verygood"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":false,"status":"good"},{"name":"b","isSelected":false,"status":"good"}]}]

var selectedButNotGood = function(document){
  return document.isSelected && 
    document.status != "good" && 
    document.status != "verygood"
}

var result = _.chain(data)
              .flatMap('documents')
              .some(selectedButNotGood)
              .value();

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.2/lodash.min.js"></script>

Rajesh Dixit · Accepted Answer · 2016-12-02 06:39:10Z

0

You can loop over them and create your own custom array.

var d = [{"documents":[{"name":"a","isSelected":true,"status":"good"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":true,"status":"bad"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":true,"status":"verygood"},{"name":"b","isSelected":false,"status":"good"}]},{"documents":[{"name":"a","isSelected":false,"status":"good"},{"name":"b","isSelected":false,"status":"good"}]}]

var statusList = ['good', 'verygood']
var r = d.some(function(o) {
  return o.documents.filter(x => !statusList.includes(x.status) && x.isSelected).length > 0;
});
console.log(r)

edited Dec 2, 2016 at 6:39

answered Dec 1, 2016 at 14:54

Rajesh Dixit

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