angularjs count duplicate values in array of objects

Question

I'm working with AngularJS. I have an array of objects like this:

 $scope.documents =
   [
        {
            "id": "221",
            "activate": "t"
        },
        {
            "id": "1",
            "activate": "t"        
        },
        {
            "id": "2",
            "activate": "t"        
        },
        {
            "id": "221",
            "activate": "t"        
        },
        {
            "id": "5",
            "activate": "t"        
        },
        {
            "id": "221",
            "activate": "t"        
        },
        {
            "id": "221",
            "activate": "t"        
        },
        {
            "id": "7",
            "activate": "t"        
        },
        {
            "id": "8",
            "activate": "t"        
        },
        {
            "id": "9",
            "activate": "t"        
        },
        {
            "id": "221",
            "activate": "t"        
        }

    ]

I need an angularjs function to count the number of repeated values in the array of objects.

Something like this:

  $scope.count = function(param) {

    angular.forEach($scope.preguntas, function(value, key) {
        if (value.id == param){
        ........
        ........
        }
    });

  };

but I'm not sure how I can do.

I hope the result is something like this:

count(221);
5

Any of you have any suggestions please?

Tom · Accepted Answer · 2015-04-09 20:54:43Z

1

Just increment a count variable in your if statement and return it.

$scope.count = function(param) {
  var count = 0;

  $scope.documents.forEach(function(document) {
      if(document.id === param.toString() {
        count++;
      }
  });

  return count;
};

And your markup:

<div>{{count(221)}}</div>

answered Apr 9, 2015 at 20:54

Tom

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Comments

HankScorpio · Accepted Answer · 2015-04-09 21:40:34Z

0

If you use lo-dash, you can do this:

_.countBy(documents, 'id')['221']

https://lodash.com/docs#countBy

answered Apr 9, 2015 at 21:40

HankScorpio

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