add: custom enum

test/basic/enum_test.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"strings"
 	"testing"
 )
 
@@ -26,8 +27,29 @@ func (d Day) String() string {
 	return names[d]
 }
 
+func DayOf(day string) Day {
+	switch strings.ToLower(day) {
+	case "sunday":
+		return Sunday
+	case "monday":
+		return Monday
+	case "tuesday":
+		return Tuesday
+	case "wednesday":
+		return Wednesday
+	case "thursday":
+		return Thursday
+	case "friday":
+		return Friday
+	case "saturday":
+		return Saturday
+	}
+	return Sunday
+}
+
 func TestEnum(t *testing.T) {
 	fmt.Println(Sunday)    // 输出: Sunday
 	fmt.Println(Wednesday) // 输出: Wednesday
 	fmt.Println(Day(7))    // 输出: Unknown
+	fmt.Println(DayOf("friday"))
 }