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WebUI: revise hash function

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In benchmark, using `Math.imul()` is about ~20% faster than floating
point multiplication.

PR #15475.
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Chocobo1 2021-09-27 13:54:28 +08:00 committed by GitHub
parent 982133d9b6
commit 97a8d865dc
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1 changed files with 5 additions and 4 deletions
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src/webui/www/private/scripts/client.js
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@ -88,11 +88,12 @@ const loadSelectedTracker = function() {
loadSelectedTracker();
function genHash(string) {
// origins:
// https://stackoverflow.com/a/8831937
// https://gist.github.com/hyamamoto/fd435505d29ebfa3d9716fd2be8d42f0
let hash = 0;
for (let i = 0; i < string.length; ++i) {
const c = string.charCodeAt(i);
hash = (c + hash * 31) | 0;
}
for (let i = 0; i < string.length; ++i)
hash = ((Math.imul(hash, 31) + string.charCodeAt(i)) | 0);
return hash;
}