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AnuchitO/go1.13_error_wrapping.go

Last active September 26, 2019 00:48
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go1.13_error_wrapping.go
errOriginal := &os.PathError{Op: "read", Path: "/a/b", Err: errors.New("read error")}
// ไม่ได้ห่อ แค่สร้าง error ใหม่จาก error เดิม
err := fmt.Errorf("create new error: %v", errOriginal)
fmt.Printf("error value: %T\n", err)
// สร้าง error ใหม่ ยังเก็บ(ห่อ) type เดิมไว้ข้างใน
err = fmt.Errorf("wrapped error: %w", errOriginal)
fmt.Printf("error value: %T\n", err)
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