What is `TaskGroup` and when would you use it?

Secure Comparator is a zero-knowledge protocol that lets two parties confirm they hold the same secret without either side transmitting it, or leaking anything usable when the secrets differ.
TaskGroup lets you run multiple async tasks in parallel and collect all their results.
Use protoc with the Swift plugin to generate Swift files from a .proto file provided by the backend team.
A memory leak is memory that is allocated but never freed — usually from retain cycles.

Answer: TaskGroup lets you run multiple async tasks in parallel and collect all their results. Use it when you have a dynamic number of parallel operations.

Code Example:

func fetchAllUsers(ids: [Int]) async throws -> [User] {
    try await withThrowingTaskGroup(of: User.self) { group in
        for id in ids {
            group.addTask {
                try await fetchUser(id: id)
            }
        }

        var users: [User] = []
        for try await user in group {
            users.append(user)
        }
        return users
    }
}

// All fetches run in parallel — much faster than sequential await
let users = try await fetchAllUsers(ids: [1, 2, 3, 4, 5])

Key Points:

withTaskGroup for non-throwing tasks
withThrowingTaskGroup when tasks can throw
Results arrive in completion order, not the order tasks were added