gistfile1.js

function editExistingVarient() {

              var variantIdentifier = $scope._getVariantIdentifiersBase();

              //no product exists with this combination of varient, lets add it to the array.
              var productIdCounter = 1;
              var productSku = 0;
              var barcode = 0;
              var barcode2 = 0;
              var counter = 1;
              var skuCounter = 100;
              var barcodeCounter1 = 100;
              var barcodeCounter2 = 101;
              var variantValues = variantIdentifier;

            _.forEach(variantIdentifier, function(variant) {
                var productWithVariant = _.find($scope.product.products, function(product) {
                    return product.variants[0] == variant[0] && product.variants[1] == variant[1];
                });

                if (!productWithVariant) {

                    $scope.product.products.push(_createProductVariant(variant));

                } else {
                    //product is found in the combination so lets not remove it
                    productWithVariant.removeFlag = true;

                }
            });

            //remove any item that was added or found to be in the combination
            $scope.product.products = _.remove($scope.product.products, function(product) {return product.removeFlag;});
            
        }