BehaviorRelay in RxSwift

let disposeBag = DisposeBag()
//1
let behaviourRelay = BehaviorRelay<String>(value: "")
//2
let subscription1 = behaviourRelay.subscribe(onNext:{ string in
    print("subscription1: ", string)
})
//3
subscription1.disposed(by: disposeBag)
//4
// subscription1 receives these 2 events, subscription2 won't
behaviourRelay.accept("Hey")
behaviourRelay.accept("there")
//5
// subscription2 will not get "Hey" because it susbcribed later but "there" will be received as it was the last event
let subscription2 = behaviourRelay.subscribe(onNext:{ string in
    print("subscription2: ", string)
})
//6
subscription2.disposed(by: disposeBag)
//7
behaviourRelay.accept("Both Subscriptions receive this message")

Result:
subscription1:  
subscription1:  Hey
subscription1:  there
subscription2:  there
subscription1:  Both Subscriptions receive this message
subscription2:  Both Subscriptions receive this message