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TikTok does `new Date((new Date).getTime() - 864e5 * e).toLocaleDateString("en-US")` a lot
Like 300 times per day of active use in the last 14 days for every instrumented event.
e.g. in my profile with 7 days of active use it does it 2072 times for every hover, click etc.
We ended up doing a Firefox release to deal with this: https://bugzilla.mozilla.org/show_bug.cgi?id=1954323
@jrmuizel so there is actually a group of people who use Firefox and Tiktok.
Never would have guessed.
@jrmuizel this tries to get today's date at midnight, in a very glorified form?
@crystalmoon @jrmuizel As far as I understand, it tries to get the localized string for n days ago. In the issue tracker, the unminified version uses `dateNdaysAgo` as the variable name. It subtracts the function argument times 864e5, the number of milliseconds in a day, from the current datetime.
If i make a shitty website, will firefox make something to avoid my website crashing ?
(Maybe i don't understand something)
@jrmuizel As a dev, I’ve also noticed that toLocaleDateString is a much more expensive function than you might naively expect. Anybody knows of a good writeup about that?