From 35b15b94810c08b74a438138b8e2554089b9bd95 Mon Sep 17 00:00:00 2001
From: "hiroaki.takeo" <takeo.hiroaki@eversense.co.jp>
Date: Mon, 24 Jun 2019 18:29:54 +0900
Subject: [PATCH] add keys fn.

---
 builtin/map.v | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/builtin/map.v b/builtin/map.v
index fdc420a0e2..cbf7d8fae8 100644
--- a/builtin/map.v
+++ b/builtin/map.v
@@ -108,6 +108,15 @@ pub fn (m mut map) sort() {
 	m.is_sorted = true
 }
 
+fn (m map) keys() []string {
+	mut keys := []string{}
+	for i := 0; i < m.entries.len; i++ {
+		entry := m.entries[i]
+		keys << entry.key
+	}
+	return keys
+}
+
 fn (m map) get(key string, out voidptr) bool {
 	if m.is_sorted {
 		// println('\n\nget "$key" sorted')