AngularJS – Binding radio buttons to models with boolean values

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The correct approach in Angularjs is to use ng-value for non-string values of models.

Modify your code like this:

<label data-ng-repeat="choice in question.choices">
  <input type="radio" name="response" data-ng-model="choice.isUserAnswer" data-ng-value="true" />
  {{choice.text}}
</label>

Ref: Straight from the horse’s mouth

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