A wrapper around a repeating timer that does not require invalidation.

Pendulum.swift

/// A wrapper around a repeating timer that does not require invalidation.
final class Pendulum {
    let timer: Timer

    init(seconds: TimeInterval, closure: @escaping () -> ()) {
        timer = Timer.scheduledTimer(
            withTimeInterval: seconds,
            repeats: true,
            block: { _ in
                closure();
        })
    }

    deinit {
        timer.invalidate()
    }
}