Comment by roncesvalles
3 months ago
My cardinal rule in Go is just don't use interfaces unless you really, really need to and there's no other way. If you're using interfaces you're probably up to no good and writing Java-ish code in Go. (usually the right reason to use interfaces is exportability)
Yes, not even for testing. Use monkey-patching instead.
> My cardinal rule in Go is just don't use interfaces unless you really, really need to and there's no other way.
They do make some sense for swappable doodahs - like buffers / strings / filehandles you can write to - but those tend to be in the lower levels (libraries) rather than application code.