Why can't you assign to multiple variables at once?

Why isn’t it possible to assign values to two variables at once even though you can define them at the same time?

For example, this works:

let (mut prev, mut curr) = (3i32, 5i32);
println!("{}, {}", prev, curr);

But this does not:

let (mut prev, mut curr) = (3i32, 5i32);

(prev, curr) = (curr, prev + curr);

println!("{}, {}", prev, curr);

Shouldn’t there be a nice way to give both of these variables new values at the same time since they depend on each other? In Python the swap works as expected, and it makes a lot of code easier to read/write.


This has been suggested before; I opened an issue for it here.


Okay, cool. (I searched for “swap variables,” not “destructuring assignment,” which is why I couldn’t find it.)

I hope this feature gains traction. It’s one of the (many) reasons Python code looks so elegant.

This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.