Rust supports polymorphism with traits. Traits allow us to associate a set of methods with a struct type.
We first define the signatures of methods of a trait within:
trait MyTrait {
fn foo(&self);
...
}
When a struct implements a trait, it establishes a contract that allows us to indirectly interact with the struct
through the trait type (e.g. &dyn MyTrait) without having to know the real type.
A struct's implemented traits methods are defined within an implementation block:
impl MyTrait for MyStruct {
fn foo(&self) {
...
}
...
}