Исходники и презентации

lessons/errors/multierror/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/hashicorp/go-multierror"
+)
+
+var (
+	ErrNumber1 = errors.New("error 1")
+	ErrNumber2 = errors.New("error 1")
+	ErrNumber3 = errors.New("error 3")
+)
+
+// fully compatible with the Go standard library errors package
+//     works for errors.Is, errors.As and errors.Unwrap
+
+func main() {
+	var err error
+	err = multierror.Append(err, ErrNumber1)
+	err = multierror.Append(err, ErrNumber2)
+	err = fmt.Errorf("internal error: %w", err)
+
+	if errors.Is(err, ErrNumber1) {
+		fmt.Println("found error1 with errors.Is")
+	}
+	if errors.Is(err, ErrNumber2) {
+		fmt.Println("found error2 with errors.Is")
+	}
+	if errors.Is(err, ErrNumber3) {
+		fmt.Println("found error3 with errors.Is")
+	}
+}