dev-golang

Create a buffered task channel, spawn a fixed number of worker goroutines that range over the channel, and use sync.WaitGroup to wait for completion. Close the channel to signal shutdown and always propagate context for cancellation.

Define a slice of anonymous structs holding test name, inputs, and expected outputs, then loop over them calling t.Run for each case. Add t.Parallel for parallel subtests and run with the -race flag to detect data races.

Use a DDD layout with cmd/ for entry points and internal/ split into domain, application, adapter, and infra layers. The domain layer holds entities and repository interfaces with zero third-party dependencies, while implementations live in infra.

Yes, Go 1.18+ supports union constraints using the pipe syntax such as int | string inside an interface constraint. Use the tilde prefix like ~int to also match named types whose underlying type is int.

Goroutine leaks happen when goroutines block forever on channels with no sender or lack cancellation handling. Always pass context.Context, select on ctx.Done(), and ensure every goroutine has a defined lifecycle and exit path.

Avoid reflection unless there is a clear performance-justified reason, since it bypasses compile-time type safety and hurts readability. Prefer generics, interfaces, or code generation for type-flexible logic.