چیت‌شیت Rust

1use std::fs;23fn read_config(path: &str) -> Result<String, std::io::Error> {4    let contents = fs::read_to_string(path)?;5    Ok(contents)6}

1let display_name = user2    .as_ref()3    .map(|user| user.name.trim())4    .filter(|name| !name.is_empty())5    .unwrap_or("Guest");

1enum Status {2    Ready,3    Failed(String),4}56let message = match status {7    Status::Ready => "ready".to_string(),8    Status::Failed(reason) => format!("failed: {reason}"),9};

1trait Summary {2    fn summary(&self) -> String;3}45fn print_summary(item: &impl Summary) {6    println!("{}", item.summary());7}

1use std::collections::HashMap;23let mut counts = HashMap::new();4for word in text.split_whitespace() {5    *counts.entry(word.to_lowercase()).or_insert(0usize) += 1;6}

1use std::sync::{Arc, Mutex};23let total = Arc::new(Mutex::new(0));4let shared = Arc::clone(&total);5std::thread::spawn(move || {6    *shared.lock().expect("mutex poisoned") += 1;7});