<p ng-repeat='comment in comments' ng-click='del($index,comments)'>{{comment}}</p>

$scope.delete=function(key,arr){
   arr.splice(key,1);
}

html

<p ng-repeat='comment in comments' ng-click='delete($index)'>{{comment}}</p>

js

app.controller('myCtrl', function($scope) {
    $scope.comments=[1,2,3,4]
    $scope.delete=function(i){
        $scope.comments.splice(i,1)
    }
})