main.rs

use std::io::prelude::*;

fn epic_file_line_counter(file_path: String) -> std::io::Result<usize> {
    let file = std::fs::File::open(file_path)?;
    let buf_reader = std::io::BufReader::new(file);
    Ok(buf_reader.lines().count())
}

fn virgin_single_threaded() {
    std::env::args()
        .skip(1)
        .for_each(|file_path| {
            if let Ok(boomer) = epic_file_line_counter(file_path.clone()) {
                println!("{}: {}", file_path, boomer)
            }
        })
}

fn chad_multi_threaded() {
    std::env::args()
        .skip(1)
        .map(|file_path| {
            std::thread::spawn(move || {
                (file_path.clone(), epic_file_line_counter(file_path.clone()))
            })
        })
        .collect::<Vec<_>>()
        .into_iter()
        .for_each(|t| {
            if let Ok((file_path, Ok(boomer))) = t.join() {
                println!("{}: {}", file_path, boomer)
            }
        });
}

fn main() -> std::io::Result<()> {
    // virgin_single_threaded();
    chad_multi_threaded();
    Ok(())
}