golang-patterns

Idiomatic Go prioritizes simplicity and clarity over clever solutions. Apply proven patterns: use interfaces to enable flexible composition, wrap errors to provide context, implement concurrency patterns like worker pools for scalable tasks, and design clean package structures. These practices improve readability, correctness, and long-term maintainability across modules.

Robust error handling in Go uses wrapping, sentinel errors, and error inspection to preserve context. Wrap errors with additional information as they propagate up the call stack, define sentinel errors for specific failure modes, and inspect errors at decision points. This approach enables clear debugging and graceful failure recovery.

Go's interface-first design pattern accepts interfaces and returns concrete types. Define small, focused interfaces that specify behavior rather than implementation. This enables loose coupling between components, simplifies testing through mock implementations, and allows swapping concrete types without changing client code.

Go concurrency patterns include worker pools for processing jobs efficiently and context-based cancellation for coordinating goroutines. Worker pools distribute tasks across multiple workers to prevent resource exhaustion, while context provides clean shutdown and timeout signaling. These patterns scale background task processing reliably.

Yes. Refactor existing Go services by introducing service interfaces, implementing error wrapping throughout the call stack, replacing manual goroutine management with worker pools, and restructuring packages for clarity. This improves code quality incrementally while maintaining backward compatibility.

Accept interfaces as function parameters to enable flexibility and testability; return concrete types from constructors for clear, type-safe APIs. This boundary between interface and concrete reduces coupling, simplifies reasoning about dependencies, and makes mocking in tests straightforward.