[stingraycharles]

It’s not a secret that they came from the same zeitgeist but took wildly different approaches, but inspired each other.

I still don’t understand why they’re referred to as persistent vectors rather than immutable vectors, but I digress.

[lemming]

I still don’t understand why they’re referred to as persistent vectors rather than immutable vectors, but I digress.

I believe that immutable just means, well, immutable, but persistent means that updates are achieved via structural sharing, so they’re efficient.

[whateveracct]

structural sharing = log n updates

if you think immutable updates are O(n) in 2026, you're so far behind the curve it's laughable

it's crazy how many ppl i interview just stop thinking and insist you can't do better than O(n)

[panick21_]

Can you please share these data-structures you are talking about? What papers?

[mrkeen]

Because standard libraries in mainstream languages are name-squatting on 'immutable' pretty hard.

You wanted 2+1 to yield 3, but instead you get a runtime exception telling you that 2 can't be changed.