From ef7f6fb0e1eb6b263d5e58c45f10ca94feef7f19 Mon Sep 17 00:00:00 2001
From: "Namhyeon, Go" <gnh1201@gmail.com>
Date: Fri, 29 Apr 2022 16:11:49 +0900
Subject: [PATCH] Update std.js

---
 lib/std.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/lib/std.js b/lib/std.js
index eb0ae8e..3d8a4d8 100644
--- a/lib/std.js
+++ b/lib/std.js
@@ -251,6 +251,20 @@ function addslashes(s) {
     ;
 };
 
+function cartesian(arr) {
+    return arr.reduce(function(a, b) {
+        return a.map(function(x) {
+            return b.map(function(y) {
+                return x.concat([y]);
+            })
+        }).reduce(function(a, b) {
+            return a.concat(b);
+        }, []);
+    }, [
+        []
+    ]);
+};
+
 /////////////////////////////////////////////////////////////////////////////////
 // Private APIs / Utility functions
 /////////////////////////////////////////////////////////////////////////////////
@@ -371,4 +385,6 @@ exports.require = global.require;
 
 exports.Event = StdEvent;
 exports.EventableObject = StdEventableObject;
+
 exports.alert = alert;
+exports.cartesian = cartesian;