Even or odd and factorial

In this session I learned:

• how to structure a rust project and use mod.rs files
• how to write functions and return values
• I got a lot of warnings from dead code/ unused imports, so I learned how to disable them
• I learned how to work with Result
  • learned how to do error handling
  • unwrap()
  • to create a string from "text" by using .to_string()
  • How to use Ok() and Err
  • I used the ? operator for concise error handling
• How to do unit testing
  • set up structure for unit tests
  • #[cfg(test)] and #[test] to execute tests
  • had some problems when trying to import from my code since I use this code structure:
    
  • But was eventually able to fix it with lib.rs file -> also had to make mods and fns public
  • Learned about using public scopes pub(scope)
  • Learned to use assert_eq! and assert!

... by implementing a method that checks if an integer is even or odd and a method that calculates the factorial of a non-negative integer smaller than 21 (i64 bounds)

Next things to learn:

• documentation: method/ class comments
• structs
• What the ! means exactly
• ...?