Playground subscription behaviour examples

[iv-mexx]

These examples illustrate the different behaviours at subscription between Signal and SignalProducer

The Signal example produces the following output:

--- Subscription ---

Subscriber 1 subscribes to the signal
Send value `10` on the signal
Subscriber 1 received 10
Subscriber 2 subscribes to the signal
Send value `20` on the signal
Subscriber 1 received 20
Subscriber 2 received 20

The SignalProducer example produces the following output:

--- Subscription ---

Subscriber 1 subscribes to producer
New subscription, starting operation
Subscriber 1 received 1
Subscriber 1 received 2
Subscriber 2 subscribes to producer
New subscription, starting operation
Subscriber 2 received 1
Subscriber 2 received 2

[RuiAAPeres]

Couldn't we use the logEvents operator to automate some of this?

[iv-mexx]

Hm, we could use logEvent to the same effect:

let (signal, observer) = Signal<Int, NoError>.pipe()

print("Subscriber 1 subscribes to the signal")
signal.logEvents(identifier: "Subscriber 1")
print("Send value `10` on the signal")
// subscriber1 will receive the value
observer.sendNext(10)

print("Subscriber 2 subscribes to the signal")
signal.logEvents(identifier: "Subscriber 2")

print("Send value `20` on the signal")
// Notice that now, subscriber1 and subscriber2 will receive the value
observer.sendNext(20)

But I'm not sure if this is better from a documentation point of view.
Having explicit subscribers and explicitly adding them to the signal might be more clear about whats going on (for a beginner).

[RuiAAPeres]

Makes sense to be explicit (the Playground's goal is to help beginners understanding ReactiveCocoa's behaviour)