Add source & demo.

Author: inamiy

.gitmodules

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+[submodule "Carthage/Checkouts/Nimble"]
+	path = Carthage/Checkouts/Nimble
+	url = https://github.com/Quick/Nimble.git
+[submodule "Carthage/Checkouts/Quick"]
+	path = Carthage/Checkouts/Quick
+	url = https://github.com/Quick/Quick.git
+[submodule "Carthage/Checkouts/SwiftTask"]
+	path = Carthage/Checkouts/SwiftTask
+	url = https://github.com/ReactKit/SwiftTask.git
+[submodule "Carthage/Checkouts/ReactKit"]
+	path = Carthage/Checkouts/ReactKit
+	url = https://github.com/ReactKit/ReactKit.git

Cartfile

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+github "ReactKit/ReactKit" ~> 0.7.0

Cartfile.private

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+github "Quick/Quick" ~> 0.2.2
+github "Quick/Nimble" ~> 0.3.0

Cartfile.resolved

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+github "Quick/Nimble" "v0.3.0"
+github "Quick/Quick" "v0.2.2"
+github "ReactKit/SwiftTask" "2.6.1"
+github "ReactKit/ReactKit" "0.7.0"

Carthage/Checkouts/Nimble

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+//
+//  AppDelegate.swift
+//  ReactKitCalculatorDemo
+//
+//  Created by Yasuhiro Inami on 2015/02/18.
+//  Copyright (c) 2015年 Yasuhiro Inami. All rights reserved.
+//
+
+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+    var window: UIWindow?
+
+    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
+        
+        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
+        self.window?.rootViewController = CalculatorViewController(nibName: "CalculatorViewController", bundle: nil)
+        self.window?.makeKeyAndVisible()
+        
+        return true
+    }
+
+    func applicationWillResignActive(application: UIApplication) {
+        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
+        // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
+    }
+
+    func applicationDidEnterBackground(application: UIApplication) {
+        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
+        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
+    }
+
+    func applicationWillEnterForeground(application: UIApplication) {
+        // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
+    }
+
+    func applicationDidBecomeActive(application: UIApplication) {
+        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
+    }
+
+    func applicationWillTerminate(application: UIApplication) {
+        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
+    }
+
+
+}
+

Carthage/Checkouts/Quick

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6214" systemVersion="14A314h" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6207"/>
+        <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view contentMode="scaleToFill" id="iN0-l3-epB">
+            <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <subviews>
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="  Copyright (c) 2015年 Yasuhiro Inami. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="8ie-xW-0ye">
+                    <rect key="frame" x="20" y="439" width="441" height="21"/>
+                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                    <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
+                    <nil key="highlightedColor"/>
+                </label>
+                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="ReactKitCalculator" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="kId-c2-rCX">
+                    <rect key="frame" x="20" y="140" width="441" height="43"/>
+                    <fontDescription key="fontDescription" type="boldSystem" pointSize="36"/>
+                    <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
+                    <nil key="highlightedColor"/>
+                </label>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+            <constraints>
+                <constraint firstItem="kId-c2-rCX" firstAttribute="centerY" secondItem="iN0-l3-epB" secondAttribute="bottom" multiplier="1/3" constant="1" id="5cJ-9S-tgC"/>
+                <constraint firstAttribute="centerX" secondItem="kId-c2-rCX" secondAttribute="centerX" id="Koa-jz-hwk"/>
+                <constraint firstAttribute="bottom" secondItem="8ie-xW-0ye" secondAttribute="bottom" constant="20" id="Kzo-t9-V3l"/>
+                <constraint firstItem="8ie-xW-0ye" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="MfP-vx-nX0"/>
+                <constraint firstAttribute="centerX" secondItem="8ie-xW-0ye" secondAttribute="centerX" id="ZEH-qu-HZ9"/>
+                <constraint firstItem="kId-c2-rCX" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="fvb-Df-36g"/>
+            </constraints>
+            <nil key="simulatedStatusBarMetrics"/>
+            <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
+            <point key="canvasLocation" x="548" y="455"/>
+        </view>
+    </objects>
+</document>

Carthage/Checkouts/ReactKit

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+//
+//  CalculatorViewController.swift
+//  ReactKitCalculatorDemo
+//
+//  Created by Yasuhiro Inami on 2015/02/18.
+//  Copyright (c) 2015年 Yasuhiro Inami. All rights reserved.
+//
+
+import UIKit
+import ReactKit
+import ReactKitCalculator
+
+class CalculatorViewController: UIViewController {
+
+    @IBOutlet var nonClearButtons: [UIButton]!
+    @IBOutlet var clearButton: UIButton!
+    
+    @IBOutlet var textField: UITextField!
+    @IBOutlet var historyLabel: UILabel!
+    
+    var calculator: Calculator?
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        self.setupSubviews()
+        self.setupSignals()
+    }
+    
+    func setupSubviews()
+    {
+        for subview in (self.nonClearButtons + [self.clearButton]) {
+            subview.layer.borderWidth = 0.5
+            subview.layer.borderColor = UIColor.blackColor().colorWithAlphaComponent(0.5).CGColor
+        }
+        
+        self.historyLabel.text = ""
+    }
+
+    func setupSignals()
+    {
+        self.calculator = Calculator { mapper in
+            
+            let alternativeMappingTuples = [
+                ("×", Calculator.Key.Multiply), // convert "×" to "*"
+                ("÷", Calculator.Key.Divide)    // convert "÷" to "/"
+            ]
+            
+            // map buttonSignal to calculator via `button.title`
+            for button in self.nonClearButtons {
+                let buttonTitle = button.titleForState(.Normal)
+                let defaultMappedKey = Calculator.Key(rawValue: buttonTitle!)
+                
+                let key = defaultMappedKey ?? (alternativeMappingTuples.filter { $0.0 == buttonTitle }.first?.1) ?? nil
+                
+                if let key = key {
+                    mapper[key] = button.buttonSignal()
+                }
+            }
+            
+            // manually map `.Clear` & `.AllClear`
+            for clearKey in Calculator.Key.clearKeys() {
+                mapper[clearKey] = self.clearButton.buttonSignal { button -> Bool in button?.titleForState(.Normal) == clearKey.rawValue }
+                    .filter { $0 == true }
+                    .map { _ in () as Void }    // .asSignal(Void)
+            }
+        }
+        
+        // REACT
+        (self.textField, "text") <~ self.calculator!.outputSignal
+        (self.historyLabel, "text") <~ self.calculator!.expressionSignal
+
+        // REACT: toggle C <-> AC
+        self.calculator!.inputSignal ~> { [weak self] key in
+            if contains(Calculator.Key.numKeys(), key) {
+                self?.clearButton?.setTitle("C", forState: .Normal)
+                
+            }
+            else if key == .Clear {
+                self?.clearButton?.setTitle("AC", forState: .Normal)
+            }
+        }
+    }
+
+}