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Merge pull request #18391 from twbs/double-bitwise-not-comment
util.js: Add comment explaining ~~ trick
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@ -99,7 +99,7 @@ const Util = (($) => {
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getUID(prefix) {
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do {
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prefix += ~~(Math.random() * 1000000)
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prefix += ~~(Math.random() * 1000000) // "~~" acts like a faster Math.floor() here
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} while (document.getElementById(prefix))
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return prefix
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},
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