TIL: Rust & Advent of Code

For the first time I’ve decided to try to rewrite some solutions to Rust.

Data structres

• if I have a counter, it has to be mut, because it’s mutable: let mut sum = 0;
• when assigning a value which cannot be None then we use Some to avoid rull referece errors

  let mut first = None;
  if first.is_none() {
    first = Some(ch);
  }
  

Iterating

• Rust uses if let construction for pattern matching and conditional execution:
  • firstly it checks the condition
  • then it extraacts values from Option
  • then it binds them to variables

if let (Some(first_number), Some(last_number)) = (first, last) {
    ...
}

-> is equivalent to Python:

if first is not None and last is not None:
    first_number = first
    last_number = last

else:
    ...

Casting

TBA

Reading from a file

TBA