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userturkey13 sieg/heil  1yr ago (text post) 630 thread views #128650

Advent of code day 4 :marseysad:

This is the advent of code day 4 thread for bragging about your solution and bullying people who haven't gotten it yet :marseyill:

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Anyone else doing Rust?

![](/images/16701799855292351.webp)

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Why even use rust at this point? folds without named functions make code almost unreadable (readable, but you have to spend more time to understand it)

Anyway, here's mine:

use std::fs::File;
use std::io::{BufRead, BufReader};
use std::str::FromStr;


struct Range {
    start: i32,
    finish: i32,
}


impl Range {
    fn includes(&self, other: &Range) -> bool {
        return self.start <= other.start && self.finish >= other.finish;
    }

    fn overlaps(&self, other: &Range) -> bool {
        return self.finish >= other.start && self.start <= other.finish
    }
}


impl FromStr for Range {
    type Err = &'static str;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let (start, finish) = s.split_once('-').ok_or_else(|| "no '-' in range")?;
        let start = start.parse::<i32>().map_err(|_| "invalid start")?;
        let finish = finish.parse::<i32>().map_err(|_| "invalid finish")?;
        Ok(Range{start, finish})
    }
}


fn main() {
    let file = File::open("input.txt").expect("Can't open input file");
    let reader = BufReader::new(file);

    let result = reader.lines().filter(|line| {
        let line = line.as_ref().expect("Can't read a line from file");
        let (left, right) = line.split_once(',').expect("No ',' in line");
        let left = left.parse::<Range>().expect("Can't convert");
        let right = right.parse::<Range>().expect("Can't convert");
        left.overlaps(&right) // left.includes(&right) || right.includes(&left)
    }).count();

    println!("{}", result);
}
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Why even use rust at this point?

I like the language

folds without named functions make code almost unreadable (readable, but you have to spend more time to understand it)

for loops are evil

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I'm not a masochist, it felt like I was staring at black boxes hidden in more boxes looking at stdlib. might just be r-slurred though

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Filtered

:#marseyitsover:

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