Pragmatic Error Handling in Go

Beyond if err != nil - techniques that work.

Always Wrap

return fmt.Errorf("get order %s: %w", id, err)

Sentinels

var ErrNotFound = errors.New("not found")

HTTP Pattern

type HandlerFunc func(w http.ResponseWriter, r *http.Request) error

errgroup

g, ctx := errgroup.WithContext(ctx)
g.Go(func() error { return fn() })

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