In angularJS sometimes I'm using curly braces sometimes I can just put it in double quote. Take the following
<ul ng-repeat="question in questionModel.questionaire">
<ul ng-repeat="answer in question.answers">
ng-model = "question.answered"
Curly braces handle the interpolation of a value to a string. If you are using a directive that requires a string value, then you should use curly braces.
At all other times, you're omitting the curly braces. This is because value passed to the directive is either a function reference (as in your
ngClick directive), or is an object (as in your