util.js: Add comment explaining ~~ trick

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util.js: Add comment explaining ~~ trick
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a887a120 · Chris Rebert · e458c7b0 · a887a120
Commit a887a120 authored 9 years ago by Chris Rebert
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+1 -1
--- 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
    },