Not pushing duplicate object in array

I have a json skills , I need to multiselect the skills from dropdown model.skills , I use multipleSkills()to push the selected values in arrayvalues[], but I should not push duplicate values into arrayvalues.

Json :

var skills = 
[{"name":{"skillId":1,"skillName":"JAVA"}},
{"name":{"skillId":2,"skillName":"C"}},
{"name":{"skillId":3,"skillName":"DEVOPS"}},
{"name":{"skillId":4,"skillName":"ANGULAR JS"}},
{"name":{"skillId":41,"skillName":"drupal"}},
{"name":{"skillId":42,"skillName":"backbone js"}},
{"name":{"skillId":43,"skillName":"nodejs"}},
{"name":{"skillId":44,"skillName":"phone gap"}},
{"name":{"skillId":45,"skillName":"scala"}},
{"name":{"skillId":46,"skillName":"spark"}}]

html:

<input class="form-control1" type="text" name="skills" placeholder="Core Skills" 
ng-model="model.Skills"  ng-focus="skillsforJobs(model.Skills)" typeahead ="skill as skill.name.skillName for skill in skills | filter:$viewValue | limitTo:10"  typeahead-on-select="multipleSkills(model.Skills)" ng-minlength =1/>

JS:

    $scope.arrayvalues = [];
    $scope.multipleSkills = function(data){
        if($scope.arrayvalues.length <1){
              $scope.arrayvalues.push(data);
          } else if($scope.arrayvalues.length > 0){
             if($scope.arrayvalues.indexOf($scope.model.Skills) == -1) {                
              if($scope.model.Skills != ""){
                   for( var i=0; i<$scope.arrayvalues.length;i++){

              $scope.arrayvalues[i].name.skillId.indexOf( data.name.skillId){
              $scope.arrayvalues.push(data);
                                  $scope.model.Skills = "";

                    }

                    }

        } 

        }

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/10/10/not-pushing-duplicate-object-in-array/
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