SwiftでReactive Programming ref: http://qiita.com/shoheiyokoyama/items/60aa617ab39778d73110

file0.swift

stream
 .buffer(関数)
 .map(関数)
 .filter(関数)
 .subscribe(処理)

file1.swift

var c = ""
var a = 1
var b = 2

if a + b >= 0 {
    c = "\(a + b) is positive"
}

a = 4
print(c)//"3 is positive"

file2.swift

import RxSwift

let a = Variable(1)
let b = Variable(2)

let c = Observable.combineLatest(a.asObservable(), b.asObservable()) { $0 + $1 }
    .filter { $0 >= 0 }
    .map { "\($0) is positive" }
    .subscribeNext { print($0) }//"3 is positive"

a.value = 4//"6 is positive"
b.value = 6//"10 is positive"
b.value = -8// doesn't print anything

file3.swift

let a = Variable(1)
let b = Variable(2)

file4.swift

let c = Observable.combineLatest(a.asObservable(), b.asObservable()) { $0 + $1 }//Observableを返している
    .filter { $0 >= 0 }//combineLatestを参照し、新しいObservableを返す
    .map { "\($0) is positive" }//filterを参照し、新しいObservableを返す
    .subscribeNext { print($0) }//mapを参照し、新しいObservableを返す

file5.swift

import RxSwift
import RxCocoa
...

@IBOutlet weak var textField: UITextField!
@IBOutlet weak var label: UILabel!

let disposeBag = DisposeBag()
...

textField.rx_text
            .subscribeNext { [unowned self] text in
                self.label.text = text
            }
            .addDisposableTo(disposeBag)

file6.swift

import RxSwift
import RxCocoa
...

 @IBOutlet weak var button: UIButton!
 let disposeBag = DisposeBag()
...

button.rx_tap
            .subscribeNext { _ in
                print("tapped!")
            }
            .addDisposableTo(disposeBag)

file7.swift

import RxSwift
import RxCocoa
...

@IBOutlet weak var slider: UISlider!
@IBOutlet weak var label: UILabel!

let disposeBag = DisposeBag()
...

slider.rx_value
            .map { String($0) }
            .subscribeNext { [unowned self] text in
                self.label.text = text
            }
            .addDisposableTo(disposeBag)