From a887a1207c3193a7389a4b84c22991e9a91d82a6 Mon Sep 17 00:00:00 2001
From: Chris Rebert <github@chrisrebert.com>
Date: Mon, 30 Nov 2015 23:47:56 -0800
Subject: [PATCH] util.js: Add comment explaining ~~ trick

[skip sauce]
[skip validator]
---
 js/src/util.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/src/util.js b/js/src/util.js
index f4a584125f..fccf6178cc 100644
--- a/js/src/util.js
+++ b/js/src/util.js
@@ -99,7 +99,7 @@ const Util = (($) => {
 
     getUID(prefix) {
       do {
-        prefix += ~~(Math.random() * 1000000)
+        prefix += ~~(Math.random() * 1000000) // "~~" acts like a faster Math.floor() here
       } while (document.getElementById(prefix))
       return prefix
     },