Generate author link

Hi!

After I retrieve list values I can get Author with

var createdBy = item.get_item("Author");

createdBy.get_lookupValue();

Now I would need to generate url to that user profile page. How can I do it? How can I get needed info to generate link like this:

https://xxxxx-my.sharepoint.com/Person.aspx?accountname=i%3A0%23.f|membership|tomislav%40zorcec.onmicrosoft.com

Thank you!