angularjs - How do perform an "except" filter in Angular? -

suppose have angular view allows user check books out of library. data model consists of 2 arrays of book entities each have unique id field plus title field. first array contains entity every book in library , second array contains entity every book user has checked out.

librarybooks = [{     id: 0,     title: "the adventure of tom sawyer"}, {     id: 1,     title: "moby dick" }, {     id: 2,     title: "to kill mockingbird" }, {     id: 3,     title: "the 3 little pigs" }]; checkedoutbooks = [{     id: 0,     title: "the adventure of tom sawyer"}, {     id: 3,     title: "the 3 little pigs" }]; 

in short, library has 4 books , user has checked out two. if want list books both arrays, can write this:

<h1>library books</h1> <div ng-repeat="book in librarybooks">     {{ book.title }} </div> <h1>checked out books</h1> <div ng-repeat="book in checkedoutbooks">     {{ book.title }} </div> 

suppose want display third list: subset of library books user has not checked out.

i have seen examples angular "filter" used specify 1 particular value should not matched in order narrow down list, in case, want exclude multiple values, how go doing this?

i have seen examples custom filter added angular module, think in case, custom filter should scoped controller.

i've got figured out. solution write filter function , attach $scope so:

function filter_notcheckedout(book) {     var i;     (i = 0; < that.librarybooks.length; += 1) {         if (that.librarybooks[i].id === page.id) {             return false;         }     }     return true; } 

in view, can referenced this:

<h1>books not checked out</h1> <div ng-repeat="book in librarybooks | filter:filter_notcheckedout">     {{ book.title }} </div>