Hey everyone, new to Rust and just checking my high level understanding of String vs str. A String type is a container for a str that is stored on the heap. String keeps the ownership, str is simply a reference and will most commonly be seen as &str. The heuristic I have in my head is that a String type should only be seen as part of the type that owns it. For example, as part of a struct definition. When being passed into methods, or returning data from a method, then use an &str type as thi...

I have multiple types with similar methods. I want to abstract over them by writing an interface, like I would in Java:
public interface Shape {
public float area();
}

class Circle implements ...