this post was submitted on 11 Jul 2025
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Programming
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I am a frontend dev. JavaScript (well, TypeScript) is my bread and butter. Even knowing its quirks I never would have thought how inconsistent
Dateactually is. I encourage everyone to try this quiz.This is what JavaScript haters should bring forth, not
0.1 + 0.2 !== 0.3!Floating point rounding issues are basic comp science issues. Hopefully nobody thinks that those are JavaScript quirks.
Unfortunately, people do.
There is a reason almost everyone use some Date lib, like Luxon and not the built in. And well, having a horrible built in lib that they can't change due to legacy code breaking is nothing really new or unique to JS.
The built-in lib is fine for basic stuff unless you do some crazy shit like expecting
"2"to parse as a valid date.For very basic things maybe, but it has a lot of other weird problems and restrictions. Mutability, no real timezone support, very limited arithmetic, to name a few. As soon as you move beyond the very basic, you want someting more robust.
Or the ones where people point out how inconsistent JS is with adding strings to numbers.
Yeah, maybe don't do arithmetic on numbers as strings?