Traits

Rust lets you abstract over types with traits. They’re similar to interfaces:

trait Pet {
    /// Return a sentence from this pet.
    fn talk(&self) -> String;

    /// Print a string to the terminal greeting this pet.
    fn greet(&self);
}

This slide and its sub-slides should take about 10 minutes.

A trait defines a number of methods that types must have in order to implement the trait.
In the “Generics” segment, next, we will see how to build functionality that is generic over all types implementing a trait.