angularjs - What are the differences between ng-repeat and ng-options and why do they not behave the same way?

Question

How do ng-options and ng-repeat differ?

In the following code, I have an ng-repeat that iterates through a list of people:

 <select ng-model="selectedPerson" >
          <option ng-repeat="obj in people" value="{{obj.id}}">{{obj.name}}</option>
  </select>

Here is what I believe to be an equivalent select box in using ng-options:

 <select ng-model="selectedPerson" ng-options='obj.name for obj in people'></select>

I would expect them to behave the same, but they do not. Why?

$scope.people = [
        {
            id: 0,
            name: 'Leon',
            music: [
                'Rock',
                'Metal',
                'Dubstep',
                'Electro'
            ]
        },

Answer 1

ng-repeat creates a new scope for each iteration so will not perform as well as ng-options.

For small lists, it will not matter, but larger lists should use ng-options. Apart from that, It provides lot of flexibility in specifying iterator and offers performance benefits over ng-repeat.