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---
name: go-patterns
description: This skill should be used for Go idioms, error handling, goroutines, interfaces, and testing, golang, Go language, Go modules, Go concurrency
whenToUse: Go code, Go patterns, goroutines, Go testing, golang, .go files, Go modules, Go error handling, Go interfaces, Go concurrency
whenNotToUse: Non-Go code, CGo interop, Rust, other systems languages
seeAlso:
- skill: testing-strategies
when: Go test architecture
- skill: api-design
when: Go HTTP services
---
# Go Patterns
Idiomatic Go patterns for Go 1.21+.
## Error Handling
```go
if err != nil {
return fmt.Errorf("failed to process %s: %w", id, err)
}
```
## Interfaces
Small interfaces (1-3 methods). Accept interfaces, return structs.
```go
type Reader interface {
Read(p []byte) (n int, err error)
}
```
## Table-Driven Tests
```go
tests := []struct{
name string
input, want int
}{
{"positive", 2, 3},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := Fn(tt.input); got != tt.want {
t.Errorf("got %d, want %d", got, tt.want)
}
})
}
```
## Concurrency
Always propagate context for cancellation:
```go
func work(ctx context.Context) error {
select {
case <-ctx.Done():
return ctx.Err()
default:
// do work
}
}
```
## Defer for Cleanup
```go
f, err := os.Open(path)
if err != nil { return err }
defer f.Close()
```
