localStorageService.bind to return a deregistration function

src/angular-local-storage.js

@@ -365,6 +365,8 @@ angularLocalStorage.provider('localStorageService', function() {
       return storageType;
     };
 
+    // Add a listener on scope variable to save its changes to local storage
+    // Return a function which when called cancels binding
     var bindToScope = function(scope, scopeKey, def, lsKey) {
       if (!lsKey) {
         lsKey = scopeKey;
@@ -380,7 +382,7 @@ angularLocalStorage.provider('localStorageService', function() {
 
       $parse(scopeKey).assign(scope, value);
 
-      scope.$watchCollection(scopeKey, function(newVal) {
+      return scope.$watchCollection(scopeKey, function(newVal) {
         addToLocalStorage(lsKey, newVal);
       });
     };

test/spec/localStorageSpec.js

@@ -277,6 +277,23 @@ describe('localStorageService', function() {
     expect($rootScope.property).toEqual(localStorageService.get('property'));
   }));
 
+  it('should be able to unbind from scope variable', inject(function($rootScope, localStorageService) {
+
+    localStorageService.set('property', 'oldValue');
+    var lsUnbind = localStorageService.bind($rootScope, 'property');
+
+    $rootScope.property = 'newValue';
+    $rootScope.$digest();
+
+    expect($rootScope.property).toEqual(localStorageService.get('property'));
+
+    lsUnbind();
+    $rootScope.property = 'anotherValue';
+    $rootScope.$digest();
+
+    expect($rootScope.property).not.toEqual(localStorageService.get('property'));
+  }));
+
   it('should be able to bind to properties of objects', inject(function($rootScope, localStorageService) {
 
     localStorageService.set('obj.property', 'oldValue');