rust_notes.MD

Notes about the Rust language

• supports tuples (T, T) is a tuple of type T.
• supports pattern matching
• unit return type = (), similar to void in Java and Unit in Scala
• Supports options with Some and None.
• Enums are algebraic data types.
• Falliable functions should return a Result value.
• ! suffix on a name indicates that it is a macro.

The ? operator:

This ? operator exists as a shortcut to writing:

let output = match File::create(filename) {
    Ok(f) => { f }
    Err(e) => { return Err(e); }
};

However, the ? does not work in the main function because the main function does not have a return value.

The vec! macro:

The macro call vec![v; n] create a vector n elements long with the elements initialized to v.