cennydavidsson

class CalculatorViewControllerTests: XCTestCase {
    func testEquationLabel_OnLoad_TextShouldBeEmpty() {
        let sut = makeLoadedViewController()
      
        XCTAssertEqual("" ,sut.EquationLabel.text)
    }

    func test_CalculateButton_TouchUpInside_ShouldCalculateEquationText() {
        let sut = makeLoadedViewController()
        sut.EquationLabel.text = "3+5"

cennydavidsson

struct Superhero: SuperheroType {
    
    let name: String
    let secretIdentiy: String
    
    let canFly: Bool
    let powerLevel: Int
}

protocol SuperheroType {

cennydavidsson

struct Superhero {
    
    let name: String
    let secretIdentiy: String
    
    let canFly: Bool
    let powerLevel: Int
    
    func flyToLocation(location: Location) {/* implementation */}
    

cennydavidsson

func add(x: Int?, y: Int?) -> Int? {
    guard let x = x where x.isEven else { return .None }
    guard let y = y else { return .None }
    
    return x + y
}

cennydavidsson

func add(x: Int?, y: Int?) -> Int? {
    guard let x = x, y = y where x.isEven else { return .None }

    return x + y
}

cennydavidsson

extension IntegerType {
    var isEven: Bool {
        return self % 2 == 0
    }
}

cennydavidsson

func add(x: Int?, y: Int?) -> Int? {
    if let x = x, y = y where x.isEven {
        return x + y
    }
    return .None
}

cennydavidsson

//
//  AttatchButton.swift
//  Solution
//
//  Created by Cenny Davidsson on 2014-10-26.
//  Copyright (c) 2014 Cenny. All rights reserved.
//

import UIKit

cennydavidsson

+ (NSCharacterSet *)validCharacters {
  return [NSCharacterSet characterSetWithCharactersInString:@"1234567890+-*()"];
}

+ (BOOL)isStringValid:(NSString *)string {
  if (!string) return NO;
  NSCharacterSet *inputSet = [NSCharacterSet characterSetWithCharactersInString:string];
  if (string.length > 1) {
    if ([[NSCharacterSet decimalDigitCharacterSet] isSupersetOfSet:inputSet]) return YES;
  }else {

cennydavidsson

func validInput(input:String) -> Bool {
  
  var last = ""
  if let x = equation.last { last = x }
  
  switch last {
  case "+", "-", "*", "(", "":
    switch input {
    case let x where input.toInt() != nil:
      return true