Исходники и презентации

lessons/errors/errors_as/main.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+)
+
+type DatabaseError struct{}
+
+func (d DatabaseError) Error() string {
+	return "database error"
+}
+
+func GetDataFromDB() error {
+	return fmt.Errorf("failed to get data: %w", DatabaseError{})
+}
+
+func main() {
+	err := GetDataFromDB()
+	if errors.As(err, &DatabaseError{}) {
+		fmt.Println(err.Error())
+	} else {
+		fmt.Println("unknown error")
+	}
+}