I’m no rust expert, but:

you can use into_iter() instead of iter() to get owned data (if you’re not going to use the original container again). With into_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) when lines() returns an iterator that you can use directly. You can instead pass lines.next().unwrap() into your functions directly.

Strings have a method called split_whitespace() (also a split_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.

Ick. At the very least, i’ve seen it a LOT less in VSC. The fact that something as simple as rainbow brackets uses the freemium model in intellij sucks. I mean the fact that it’s not a builtin setting is dumb too but that’s beside the point

The freemium and constant “are you sure you dont want to pay?” from some intellij plugins is insulting enough that it’s hard to believe any developer would praise it. Presumably this doesnt happen in vscode because it cant happen in vscode, not because people arent shameless enough to do it there.

Counterpoint, i didnt like the rust book at all (as an inexperienced self taught ~6 months to a year into learning python at the time). Programming Rust and Rust In Action were far better.

Seems you missed the last line

compiles to fast code

15532 on-type format (, by adding closing ) automatically

Thank fucking god lmao. The PR specifically mentions the Some( case too, which is exactly where i encounter this the most.

Overall very nice changes

Here’s the script. It’s nothing fancy, and iirc it only works for top level functions/classes. That means you still have to take care of attributes and methods which is a little annoying, but for simple stuff it should save a bit of time.

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.

Please don’t say the new language you’re being asked to learn is “unintuitive”. That’s just a rude word for “not yet familiar to me”…The idea that some features are “unintuitive” rather than merely temporarily unfamiliar is just getting in your way.

Well i mean… that’s kinda what “unintuitive” means. Intuitive, i.e. natural/obvious/without effort. Having to gain familiarity sorta literally means it’s not that, thus unintuitive.

I dont disagree with your sentiment, but these people are using the correct term. For example, python len(object) instead of obj.len() trips me up to this day because 99% of the time i think [thing] -> [action], and most language constructs encourage that. If I still regularly type an object name, and then have to scroll the cursor back over and type “len(”, i cant possibly be using my intuition. It’s not the language’s “fault” - because it’s not really “wrong” - but it is unintuitive.

Pyo3 doesnt generate type hints at all iirc. There’s some more info here

The gist, as i recall, is that you’re supposed to maintain a .pyi file in the rust project folder that gets automatically added in by maturin when building. I’m no regex wizard, but i was able to whip together a small script that generates simple function and class stubs that also have the rust docstring. Iirc they’re planning on adding some official support for generating type hints, but i have no idea how far along it is or where it is on the priority list