majiayu000 Go Patterns
Idiomatic Go patterns for Go 1.21+.
Error Handling
if err != nil {
return fmt.Errorf("failed to process %s: %w", id, err)
}
Interfaces
Small interfaces (1-3 methods). Accept interfaces, return structs.
type Reader interface {
Read(p []byte) (n int, err error)
}
Table-Driven Tests
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:
func work(ctx context.Context) error {
select {
case <-ctx.Done():
return ctx.Err()
default:
// do work
}
}
Defer for Cleanup
f, err := os.Open(path)
if err != nil { return err }
defer f.Close()