For downsides, i’d like to add that the lack of function overloading and default parameters can be really obnoxious and lead to [stupid ugly garbage].
A funny one i found in the standard library is in time::Duration
. Duration::as_nanos()
returns a u128, Duration::from_nanos()
only accepts a u64. That means you need to explicitly downcast and possibly lose data to make a Duration after any transformations you did.
They cant change from_nanos()
to accept u128 instead because that’s breaking since type casting upwards has to be explicit too (for some reason). The only solution then is to make a from_nanos_u128()
which is both ugly, and leaves the 64 bit variant hanging there like a vestigial limb.
I’m no rust expert, but:
you can use
into_iter()
instead ofiter()
to get owned data (if you’re not going to use the original container again). Withinto_iter()
you dont have to deref the values every time which is nice.Also it’s small potatoes, but calling
input.lines().collect()
allocates a vector (that isnt ever used again) whenlines()
returns an iterator that you can use directly. You can instead passlines.next().unwrap()
into your functions directly.Strings have a method called
split_whitespace()
(also asplit_ascii_whitespace()
) that returns an iterator over tokens separated by any amount of whitespace. You can then call.collect()
with a String turbofish (i’d type it out but lemmy’s markdown is killing me) on that iterator. Iirc that ends up being faster because replacing characters with an empty character requires you to shift all the following characters backward each time.Overall really clean code though. One of my favorite parts of using rust (and pain points of going back to other languages) is the crazy amount of helper functions for common operations on basic types.
Edit: oh yeah, also strings have a
.parse()
method to converts it to a number e.g.data.parse()
where the parse takes a turbo fish of the numeric type. As always, turbofishes arent required if rust already knows the type of the variable it’s being assigned to.