Swift Pattern Matching, Part 2: tuples, ranges & types. Shakyo practice.

PatternMatchingPart2.swift

/*
 From http://alisoftware.github.io/swift/pattern-matching/2016/03/30/pattern-matching-2/
 
 Shakyo practice
 
 Pattern Matching, Part 2: tuples, ranges & types

 */

import XCPlayground
import Foundation
import UIKit

// MARK: - tuples

let point = CGPoint(x:50, y:50)
switch (point.x, point.y) {
    case (0,0): print("orgin")
    case (0,_): print("x=0")
    case (_,0): print("y=0")
    case (let x, let y) where x==y: print("x==y")
    default: print("default")
}

// MARK: - String & Chara

let car: Character = "J"
switch car {
    case "A", "E", "I", "O", "U", "Y": print("Vowel")
    default: print("Consonant")
}



// MARK: - Range

let count = 7
switch count {
    case Int.min..<0: print("Negative!!")
    case 0: print("0")
    case 1: print("1")
    case 2..<5: print("2..<5")
    case 5..<10: print("5..<10")
    default: print("10<")
}

func charType(car: Character) -> String {
    switch car {
    case "a", "e", "i", "o", "u":
        return "Vowel"
    case "A"..."Z", "a"..."z":
        return "Consonant"
    default:
        return "Other"
    }
}

print ("William Gibson".characters.map(charType))



// MARK: - Types

protocol Medium {
    var title: String {get}
}

struct Book: Medium {
    let title: String
    let author: String
    let publishYear: Int
}

struct Movie: Medium {
    let title: String
    let director: String
    let year: Int
}

struct WebSite: Medium {
    let title: String
    let url: String
}

let media: [Medium] = [
    Book(title: "neuromancer", author: "William Gibson", publishYear: 1984),
    Movie(title: "Pacfic Rim", director: "Guillermo del Toro", year: 2013)
]

for medium in media {
    switch medium {
    case let book as Book:
        print("\(book.title)")
    case let movie as Movie:
        print("\(movie.title)")
    case let webSite as WebSite:
        print("\(webSite.title)")
    default:
        print("default")
    }
}