Can you explain what is meant by Sendable?

In the context of iOS and Swift, Sendable is a protocol that guarantees that a data type is safe to transfer between different threads (concurrency-safe). It is part of the new concurrency model in Swift, which helps avoid race conditions.

If a type conforms to Sendable, it means its instances can be safely passed between tasks or threads without risking data integrity issues. For example, simple types like Int, String, and structures without mutable state are automatically considered Sendable.

Example:

struct User: Sendable {
    let id: Int
    let name: String
}

// Now, User can be safely transferred between threads