find if an object property exists in array

$scope.purchaseOrderCheckChange = function(purorderobj){
			if($scope.itemList.length>0)
				{	
					var found = $scope.itemList.some(function(o){
						return purorderobj.PUR_REQ_NO === o.PUR_REQ_NO;
					})
					if(!found){
						$scope.itemList.push(purorderobj);
					}else{
						var index = $scope.itemList.indexOf(purorderobj);
						$scope.itemList.splice(index,1);
					}
				}
			else{
				$scope.itemList.push(purorderobj);
			}
				console.log($scope.itemList);
		}