Hacker News Reader

Another way I've heard it put is that any class ending in -er or -or is an antipattern.

Unlikely to be true, even if some such classes are indeed antipatterns.

Which of these classes are antipatterns?

Observer

FileManager

HTTPServer

CircuitBreaker

ObjectBuilder

ServiceProvider

SchemaValidator

StringTranslator

Vector

Customer

Player

User

Printer

It's quite interesting that some say it's an anti-pattern while in Go it's the standard way to name interfaces.