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rustlings

  1. const 必须指明变量类型
  2. 函数返回值类型通过 -> 指明
  3. if 必须在 {..} 中
  4. 数组元素必须是同类型的，let a: [u32; 100] = [0; 100];
  5. &str 和 String 类型的区别
  6. 模块同时导入多个 use std::time::{SystemTime, UNIX_EPOCH};
  7. HashMap 类型：entry(key).or_insert(default_value)
  8. Option/Result 解析出 Some/Ok 中的值用 unwrap()
  9. if let Some(v) = .. / While let Some(v) = ..
  10. Result 类型后添加 ?，会在 Err 类型自动返回
  11. main 函数中添加返回类型 Result<(), Box>，可以在其中使用 ?
  12. impl Wrapper 声明 Wrapper 结构体中定义的是泛型而不是具体类型
  13. 声明实现了某种 trait 的的类型可以用 impl Trait1 + Trait2 或者 Where ..
  14. ？？iter() 和 into_iter() 的区别
  15. ？？iter().map(..).collect() 会根据函数的返回值类型返回
  16. (1..=num).fold(1, |acc, elem| acc * elem)
  17. 智能指针，包括 Cow
  18. #[macro_export]
  19. clippy std::f32::consts::PI std::mem::swap
  20. from 和 into trait
  21. from_str 和 parse trait
  22. try_from 和 try_into trait
  23. as_ref 和 as_mut trait

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