this post was submitted on 31 Oct 2024
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Rust does an interesting thing in this regard. It does still have
==
for checking if two values are equal, but well, it actually doesn't have a traditional assignment operator. Instead, it has a unification operator, which programmers usually call "pattern matching".And then you can use pattern matching for what's effectively an assignment and to some degree also for equivalence comparison.
See a few examples here: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=1268682eb8642af925db9a499a6d587a
This reminds me on the niche tool in Mathematica I've been using, which has four different assignment oparators for that purpose.
It does still have a traditional assignment operator. You can assign values to mutable variables.
Also I would say let-binds are still pretty much assignment; they just support destructuring. Plenty of languages support that to some extent (JavaScript for example) and you wouldn't say they don't have assignment.
I don't think it affects the ability to overload
=
anyway. I think there aren't any situations in Rust where it would be ambiguous which one you meant. Certainly none of the examples you gave compile with both=
and==
. Maybe there's some obscure case we haven't thought of.