New JavaScript Set Methods

I'm very excited this finally shipped everywhere! Prior to this Set wasn't much more than a Map<any, true> since it had no actual Set operations.

Oh, that's a relief. Having "set" objects in JS, without having any of the standard set operations, didn't make a lot of sense.

Blog post author here in case there's any feedback or questions. Thanks for sharing :)

It was replaceAll in 2021 and now this! Who knows what we’ll get in 2030. Maybe Array.prototype.last() even.

&gt; It&#x27;s also typically faster to check if an element is in a set as opposed to in an Array<p>What optimisations allow that? As sets in javascript maintain insertion order, aren’t lookups O(n) ?

It&#x27;s a pity that you can&#x27;t implement a function in an object to consider it equal to another object with the same member values.

This&#x27;ll help with AoC. Just need sensible tuples now and we&#x27;ll be golden. See you in ten years.

Perhaps it&#x27;s asking too much but it would be great to see performance comparisons of these new set methods versus naive JS.<p>Not sure when I&#x27;ll have a chance to use them but seems pretty comprehensive in covering all the basics.

[6,-2,2,-7].sort()<p>Result : [-2,-7,2,6]<p>Ladies and Gentlemen, the lingua franca of web programming.

Huh. I might actually start using sets over just simple objects. Never found a great reason to use them before these methods, other than to show off.

Damn, in 2024?<p>Do Java next!