reusee · October 29, 2013 10:01 · Oct 29, 2013
diff --git a/reflect.go b/reflect.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+func main() {
+	l := []string{"foo", "bar", "baz"}
+	ll := Map(l, func(s string) string {
+		return strings.ToUpper(s)
+	}).([]string)
+	fmt.Printf("%v\n", ll)
+
+	il := []int{1, 2, 3}
+	ill := Map(il, func(i int) int {
+		return i * 2
+	}).([]int)
+	fmt.Printf("%v\n", ill)
+}
+
+func Map(l interface{}, f interface{}) interface{} {
+	lValue := reflect.ValueOf(l)
+	fValue := reflect.ValueOf(f)
+	retType := reflect.TypeOf(f).Out(0)
+	retSlice := reflect.MakeSlice(reflect.SliceOf(retType), lValue.Len(), lValue.Len())
+	for i := 0; i < lValue.Len(); i++ {
+		retValue := fValue.Call([]reflect.Value{lValue.Index(i)})
+		retSlice.Index(i).Set(retValue[0])
+	}
+	return retSlice.Interface()
+}