walk: refacto slice and struct

walk/walk.go

@@ -7,18 +7,23 @@ import (
 func Walk(x interface{}, fn func(string)) {
 	val := getValue(x)
 
+	numberOfValues := 0
+	var getField func(int) reflect.Value
+
 	switch val.Kind() {
-	case reflect.Struct:
-		for i := 0; i < val.NumField(); i++ {
-			// XXX: Interface() to get interface
-			Walk(val.Field(i).Interface(), fn)
-		}
-	case reflect.Slice:
-		for i := 0; i < val.Len(); i++ {
-			Walk(val.Index(i).Interface(), fn)
-		}
 	case reflect.String:
 		fn(val.String())
+	case reflect.Struct:
+		numberOfValues = val.NumField()
+		getField = val.Field
+	case reflect.Slice:
+		numberOfValues = val.Len()
+		getField = val.Index
+	}
+
+	for i := 0; i < numberOfValues; i++ {
+		// XXX: Interface() to get interface
+		Walk(getField(i).Interface(), fn)
 	}
 }