Common Anti-Patterns in Rust and How to Avoid Them

Core
2026-04-17T12:05:42+00:00
Avoid Rust anti-patterns by handling errors with Result, passing references instead of cloning, and minimizing unsafe code.

The most common anti-patterns in Rust are using unwrap() instead of Result handling, overusing unsafe blocks, and ignoring ownership rules by cloning data unnecessarily. Replace unwrap() with match or ? to handle errors gracefully, and use &T references instead of T to avoid unnecessary heap allocations.

// Anti-pattern: Panics on error
let file = std::fs::read_to_string("data.txt").unwrap();

// Fix: Propagate error with ? or handle explicitly
let file = std::fs::read_to_string("data.txt")?;
  1. Use Result and Option explicitly instead of unwrap() to prevent runtime panics.
  2. Pass references (&T) to functions instead of taking ownership (T) to avoid cloning large data structures.
  3. Avoid unsafe blocks unless you are interacting with FFI or implementing low-level abstractions that the compiler cannot verify.