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util.js: Add comment explaining ~~ trick

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This commit is contained in:
Chris Rebert 2015-11-30 23:47:56 -08:00
parent e458c7b0e6
commit a887a1207c
1 changed files with 1 additions and 1 deletions
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js/src/util.js
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@ -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
},