How To Use Go Interfaces

I occasionally give free Go consults and code review on top of my daily work. As such, I tend to read a lot of other peoples’ codes. And while this is really more of a feeling *Now, you should go, really? You're a statistician by training ffs, I’ve seen an increase in what I call “Java-style” interface usage. This blog post is a Go specific recommendation from me, based on my experiences writing Go code, on how to use interfaces well. For this blog post, the running example will span two packages: animal and circus. A lot of what I write about here is about code at the boundary of packages.