Correct way to write loops for promise.

Question

How to correctly construct a loop to make sure the following promise call and the chained logger.log(res) runs synchronously through iterat

Answer 1

How about this one using BlueBird?

function fetchUserDetails(arr) {
    return Promise.each(arr, function(email) {
        return db.getUser(email).done(function(res) {
            logger.log(res);
        });
    });
}