Differences between ng-repeat and ng-options

Differences between ng-repeat and ng-options

$scope creation :
ng-repeat - For every iteration over the collection it will create the new $scope
ng-options - For every iteration over the collection it will not create the new $scope

Performance :
ng-repeat – Performance will be degrade if the length of collection is huge.
ng-options – Performance is great when compared with ng-repeat.

Data type holding with model :
ng-repeat – ngrepeat associated with the ngmodel can hold only string type.
ng-options – ngoption associated with the ngmodel can hold even objects.

Association with ng-model :
ng-repeat – Not mandatory to have the ng-model directive.
ng-options-It’s mandatory to associate with the ng-model when we prefer ng-options

Syntax :

ng-repeat  -

<select id="test"><option ng-repeat="x in dept">{{x}}</option></select>

ng-options -

<select id="Select1" ng-model="selectedon" ng-options="x for x in dept"></select>

References :
ng-repeat : https://angularsubject.blogspot.in/2017/10/ng-repeat-in-angular-js.html
ng-options :  https://angularsubject.blogspot.in/2017/10/dropdownlist-in-angular-js.html