Example selector/method binding

binding.swift

public func <~ <Destination, Source: SignalProducerType where Source.Value == Destination>(destinationSelector: (Destination) -> (), sourceProducer: Source) -> Disposable {
    return sourceProducer.startWithNext(destinationSelector)
}

// Without binding...
viewModel.deliveryTime.producer
    .map { ($0, UIControlState.Normal) }
    .takeUntil(rac_willDeallocSignalProducer())
    .startWithNext(deliveryTimeButton.setTitle)
    
// With binding
deliveryTimeButton.setTitle <~ 
    viewModel.deliveryTime.producer
    .map { ($0, UIControlState.Normal) }
    .takeUntil(rac_willDeallocSignalProducer())

####
//  Last one probably will lead to reference cycle in some cases, but 
//  It's a bit readable in terms that you know what you're doing by reading first line of code