Create a function to get error message

CHANGELOG.md

@@ -1,3 +1,7 @@
+# v1.0.3 (Jan 7, 2023)
+
+-   Create a function to get error message.
+
 # v1.0.2 (Jan 7, 2023)
 
 -   Exception.New handles error more exactly.

error.go

@@ -51,3 +51,11 @@ func Or(errs ...error) error {
 
 	return nil
 }
+
+// Message returns only the error message.
+func Message(e error) string {
+	if xe, ok := e.(Error); ok {
+		return xe.msg
+	}
+	return e.Error()
+}

error_test.go

@@ -21,6 +21,7 @@
 package xyerror_test
 
 import (
+	"errors"
 	"testing"
 
 	"github.com/xybor-x/xycond"
@@ -67,3 +68,11 @@ func TestCombine(t *testing.T) {
 	xycond.ExpectError(err, xyerror.TypeError).Test(t)
 	xycond.ExpectErrorNot(err, xyerror.IndexError).Test(t)
 }
+
+func TestMessage(t *testing.T) {
+	var e1 = xyerror.ValueError.New(t.Name())
+	var e2 = errors.New(t.Name())
+	xycond.ExpectEqual(e1.Error(), "ValueError: "+t.Name()).Test(t)
+	xycond.ExpectEqual(xyerror.Message(e1), t.Name()).Test(t)
+	xycond.ExpectEqual(xyerror.Message(e2), t.Name()).Test(t)
+}