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5.
Wikipedia
Functional reactive programming (FRP) is a programming
paradigm for reactive programming (asynchronous dataflow
programming) using the building blocks of functional
programming (e.g. map, reduce, filter).
@EliSawic
11.
Imperative
let array = [0, 1, 2, 3, 4, 5]
var evenNumbers = [Int]()
for element in array {
if element % 2 == 0 {
evenNumbers.append(element)
}
}
@EliSawic
38.
Presentation
let (presentation, presentationObserver) = Signal<Idea, NoError>.pipe()
let content = "This presentation is a signal"
let idea = Idea(content: content, quality: .Great)
presentationObserver.send(value: idea)
presentationObserver.sendCompleted()
@EliSawic
39.
Observing
presentation.observeValues { idea in
remember(idea: idea)
}
presentation.observeCompleted {
print("Time for a break")
}
@EliSawic
40.
Only great ideas
let greatIdeas = presentation.filter { idea in
idea.quality == .Great
}
greatIdeas.observeValues { greatIdea in
remember(idea: greatIdea)
}
@EliSawic
41.
Positive listener
let greatPresentation = presentation.map { idea -> Idea in
var greatIdea = idea
greatIdea.quality = .Great
return greatIdea
}
@EliSawic
47.
Work with presentation
runPresentation().startWithValues { idea in
print(idea)
}
runPresentation().startWithSignal { (signal, _) in
signal.observeValues({ idea in
print(idea)
})
signal.observeCompleted {
print("Finally...")
}
}
@EliSawic
63.
Is name valid?
let isValidNameSignal = nameSignal.map { (name) -> Bool in
return name.characters.count > 2
}
@EliSawic
64.
Is surname valid?
let isValidSurnameSignal = surnameSignal.map { (surname) -> Bool in
return surname.characters.count > 2
}
@EliSawic
65.
Is mail valid?
let isValidMailSignal = mailSignal.map { (mail) -> Bool in
let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,}"
let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
return emailTest.evaluateWithObject(mail)
}
@EliSawic