Check if item from one object exists in another (using underscore)

Question

I am trying to compare 2 objets using underscore, specifically I am trying to compare the key/values of "id" (because other things inside will change). I basically want to just check if object A has an item that object B does not have, remove it from object A. Here is my attempt at it :

for(var c=0;c<$scope.types.length;c++){
    var real = _.some($scope.storeTempName, function(it) {
        return it.id == $scope.types[c].typeId; 
    });
    if(real){
    }else{  
        $scope.types.splice(c,1);
    }
}

Where $scope.storeTempName is object B and $scope.types is object A. So if $scope.types has something $scope.storeTempName does not, remove it (tracking by id and typyId for types).

This first attempt I have works, BUT it only will remove the first one. My guess is it's becasue I'm looping from 0 ++ and the index's are changing when i remove the first one so splice is targetting a false item. I am not sure though, and could use some help. Thank you for reading!

Your code would be significantly more readable if you just assigned $scope.......................types to something. — Sacho
– Sacho, Commented Dec 5, 2014 at 13:03
Do you need to use .splice() because of angular's data-binding? You could just use a filter otherwise. — Sacho
– Sacho, Commented Dec 5, 2014 at 13:15
@sacho I Don't need to use splice no, can you filter 2 objects against each other based off 2 different keys? — ajmajmajma
– ajmajmajma, Commented Dec 5, 2014 at 13:17

Sacho · Accepted Answer · 2014-12-05 13:21:22Z

1

Just use _.filter.

$scope.types = _.filter($scope.types, function (type) {
    return _.some($scope.storeTempName, function (it) { return it.id == type.typeId })
})

answered Dec 5, 2014 at 13:21

Sacho

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