Hi guys, first of all I just want to let you know that I'm a functional programming learner, and I'd love to see how more experienced people approach this problem. I have to process a list of email events (email was sent, email was bounced, email was a soft bounce or email was reported), aggregate them by an email campaign ID and update the corresponding counters. The solution I came up with and the test it must satisfy can be seen in this gist https://gist.github.com/davidgf/c03baedee14a758c406a58de99ea277a, but I'm not really satisfied, because it feels that I'm iterating over the entire list too many times. Given that I come from an imperative style background, I can figure out a much uglier but also much more efficient solution for this, but I wanted to see some FPer's take on this.
This one goes for the users that don't post frequently (once every few months). HN only allows username for logging in and resetting password, so if you forgot the username you're screwed.
