Each package fulfils a single purpose

• Handle errors explicitly

• Return early rather than nesting deeply

• Leave concurrency to the caller

• Before you launch a goroutine, know when it will stop

• Avoid package level state

• Simplicity matters

• Write tests to lock in the behaviour of your package’s API If you think it’s slow, first prove it with a benchmark

• Moderation is a virtue

• Maintainability counts