For the past few months I've been running a survey which asks people what they're finding difficult about learning Go. And something that keeps coming up in the responses is the concept of interfaces. I get that. Go was the first language I ever used that had interfaces, and I remember at the time that the whole concept felt pretty confusing. So in this tutorial I want to do a few things: Provide a plain-English explanation of what interfaces are; Explain why they are useful and how you might...
