What principles and requirements should be considered when creating a structure or class implementing the Equatable protocol?

When implementing the Equatable protocol in a struct or class, you need to:

• Define a static == method that compares two instances of the type and returns true if they are considered equal.
• Compare all significant properties that affect object equality.
• Ensure the comparison is symmetric, reflexive, and transitive.

Example implementation for a struct:

struct User: Equatable {
    let id: Int
    let name: String

    static func == (lhs: User, rhs: User) -> Bool {
        return lhs.id == rhs.id && lhs.name == rhs.name
    }
}

If all properties already conform to Equatable, the compiler can automatically generate the implementation.