It is simpler to bang out a [int(num) for num in text.splitlines()[0].split(' ')[1:]] in Python, but that just shows the happy path with no error handling, and does a bunch of allocations that the Rust version doesn’t. You can also get slightly fancier in the Rust version by collecting into a Result for more succinct error handling if you’d like.
EDIT: Here’s also a version using anyhow for error handling, and the aforementioned Result collecting:
Also, anyhow::Context provides a convenient way to turn Option<T> and Result<T, Into<anyhow::Error>> into anyhow::Result<T>
Like this:
use anyhow::Context;
// to my understanding it's better to // specify the types when their names // are the same as in prelude to improve// readability and reduce name clashingfnmain() -> anyhow::Result<()> {
lettext = "seeds: 79 14 55 13\nwhatever";
letseeds: Vec<u32> = text
.lines()
.next()
.context("No first line!")? // This line has changed
.split_whitespace()
.skip(1)
.map(str::parse)
.collect::<Result<_, _>>()?;
println!("seeds: {:?}", seeds);
Ok(())
}
The
collect’s in the middle aren’t necessary, neither is splitting by": ". Here’s a simpler versionfn main() { let text = "seeds: 79 14 55 13\nwhatever"; let seeds: Vec<_> = text .lines() .next() .unwrap() .split_whitespace() .skip(1) .map(|x| x.parse::<u32>().unwrap()) .collect(); println!("seeds: {:?}", seeds); }It is simpler to bang out a
[int(num) for num in text.splitlines()[0].split(' ')[1:]]in Python, but that just shows the happy path with no error handling, and does a bunch of allocations that the Rust version doesn’t. You can also get slightly fancier in the Rust version by collecting into aResultfor more succinct error handling if you’d like.EDIT: Here’s also a version using
anyhowfor error handling, and the aforementionedResultcollecting:use anyhow::{anyhow, Result}; fn main() -> Result<()> { let text = "seeds: 79 14 55 13\nwhatever"; let seeds: Vec<u32> = text .lines() .next() .ok_or(anyhow!("No first line!"))? .split_whitespace() .skip(1) .map(str::parse) .collect::<Result<_, _>>()?; println!("seeds: {:?}", seeds); Ok(()) }Also,
anyhow::Contextprovides a convenient way to turnOption<T>andResult<T, Into<anyhow::Error>>intoanyhow::Result<T>Like this:
use anyhow::Context; // to my understanding it's better to // specify the types when their names // are the same as in prelude to improve // readability and reduce name clashing fn main() -> anyhow::Result<()> { let text = "seeds: 79 14 55 13\nwhatever"; let seeds: Vec<u32> = text .lines() .next() .context("No first line!")? // This line has changed .split_whitespace() .skip(1) .map(str::parse) .collect::<Result<_, _>>()?; println!("seeds: {:?}", seeds); Ok(()) }Edit: line breaks