Is it very bad to call a function that locally computes a value from an AngularJS expression?

Question

I\'ve read an article on some AngularJS pitfalls using scopes, and it states that you should not use a function in expressions, and I understand that an expression may be evalua

Answer 1

One option is to set a $watch on the state condition. $watch can take a function parameter and so you can do this:

$scope.$watch(function(){
    return $scope.prop1 && $scope.prop2 && $scope.prop3;        
},function(val){
    $scope.state = val;
});

Here is a minimal demo