go

## What I do - Write idiomatic Go code following effective Go guidelines - Handle errors explicitly, never ignore them - Use interfaces for abstraction - Manage concurrency with goroutines and channels - Follow Go module dependency management - Use context for cancellation and timeouts - Write table-driven tests - Implement proper error wrapping ## When to use me When writing or reviewing Go code. All Go code should follow standard Go conventions. ## Error Handling ```go func (s *Service) Process(ctx context.Context, input string) error { if err := ctx.Err(); err != nil { return fmt.Errorf("context cancelled: %w", err) } if input == "" { return ErrInvalidInput } result, err := s.backend.Process(input) if err != nil { return fmt.Errorf("backend processing failed: %w", err) } return nil } ``` ## Concurrency ```go func ProcessAll(ctx context.Context, items []Item) []Result { results := make(chan Result, len(items)) var wg sync.WaitGroup for _, item := range items { wg.Add(1) go func(it Item) { defer wg.Done() result, err := ProcessItem(it) if err != nil { log.Printf("item %s: %v", it.ID, err) return } results <- result }(item) } go func() { wg.Wait() close(results) }() var out []Result for r := range results { out = append(out, r) } return out } ``` ## Interfaces ```go type Processor interface { Process(ctx context.Context, data []byte) ([]byte, error) Name() string } func NewProcessor(p Processor) *ProcessorWrapper { return &ProcessorWrapper{p: p} } ``` ## Testing ```go func TestProcess(t *testing.T) { tests := []struct { name string input string want string wantErr bool }{ {"valid input", "hello", "HELLO", false}, {"empty input", "", "", true}, } for _, tt := range tests { t.Run(tt.name, func(t *testing.T) { got, err := Process(tt.input) if (err != nil) != tt.wantErr { t.Errorf("Process() error = %v, wantErr %v", err, tt.wantErr) return } if got != tt.want { t.Errorf("Process() = %v, want %v", got, tt.want) } }) } } ``` ## Go Modules ```bash go mod init github.com/user/repo go get package@version go mod tidy go list -m all ```