AngularJS template binding to object

Question

As we all know AngularJS uses the simplest form of $watch when we bind to variable in template like this {{ $ctrl.obj }}.
It should compare value of $ctrl.obj by reference, but if I mutate $ctrl.obj the change is reflected in view. The reference doesn't changed, so why?

Answer 1

When we use brackets ({{}}) angular does not use any watch (ers) for detecting changes on the expression placed inside them. Instead this expression is dirty checked and refreshed in every $digest cycle, even if it is not necessary.

See this post: AngularJS : Why ng-bind is better than {{}} in angular?