What's the difference between a Deferred object and its own promise object?

Question

Let\'s create a simple Deferred object:

defer = $.Deferred( function ( defer ) {
    setTimeout( defer.resolve, 3000 );
});

The above Defer

Answer 1

When using the "promise" of a Deferred object the observers (objects waiting for resolve for exemple) dont have direct access to the Deferred object itself, so they can't call, for exemple, the method "Resolve" of that Deferred. It is a way of protecting the original Deferred.