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Extension.swift
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Extension.swift
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//
// Extension.swift
// ProtocolOrientedProgramming
//
// Created by A on 2021/02/15.
//
import Foundation
/// 확장
// 메소드 확장
extension String {
func getFirstChar() -> Character? {
guard count > 0 else {
return nil
}
return self[startIndex]
}
}
var myString = "This is a test"
print(myString.getFirstChar())
// subscript 추가
extension String {
subscript(r: CountableClosedRange<Int>) -> String {
get {
let start = index(self.startIndex, offsetBy: r.lowerBound)
let end = index(self.startIndex, offsetBy: r.upperBound)
return String(self[start..<end])
}
}
}
// 기본 타입 확장
extension Int {
func squared() -> Int {
return self * self
}
}
print(21.squared())
extension Double {
func currencyString() -> String {
let divisor = pow(10.0, 2.0)
let num = (self * divisor).rounded()
return "$\(num)"
}
}
extension Int {
var mySquared: Int {
return self * self
}
}
/// 프로토콜 확장
extension Collection {
func evenElements() -> [Iterator.Element] {
var index = startIndex
var result: [Iterator.Element] = []
var i = 0
repeat {
if i % 2 == 0 {
result.append(self[index])
}
index = self.index(after: index)
i += 1
} while index != endIndex
return result
}
func myShuffle() -> [Iterator.Element] {
return sorted() { left, right in
return arc4random() < arc4random()
}
}
}
var origArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
var newArray = origArray.evenElements()
var ranArray = origArray.myShuffle()
var origDict = [1: "One", 2: "Two", 3: "Three", 4: "Four"]
var returnElements = origDict.evenElements() // dictionary는 순서가 없기 때문에 원하는대로 동작하지 않음
for item in returnElements {
print(item)
}
// 확장 시 제약 추가
extension Collection where Self: ExpressibleByArrayLiteral { }
extension Collection where Iterator.Element: Comparable { }
/// 프로토콜 확장을 이용한 문장 유효성 검사
protocol TextValidation {
var regExFindMatchString: String {get}
var validationMessage: String {get}
}
// TextValidation 프로토콜 확장
extension TextValidation {
var regExMatchingString: String {
get {
return regExFindMatchString + "$"
}
}
func validateString(str: String) -> Bool {
if let _ = str.range(of: regExMatchingString, options: .regularExpression) {
return true
} else {
return false
}
}
func getMatchingString(str: String) -> String? {
if let newMatch = str.range(of: regExFindMatchString, options: .regularExpression) {
return String(str[newMatch]) // deprecated된 문법
} else {
return nil
}
}
}
class AlphabeticValidation: TextValidation {
static let sharedInstance = AlphabeticValidation()
private init() {}
// 알파벳 문자가 0개에서 10개 있는지 확인
let regExFindMatchString = "^[a-zA-Z]{0,10}"
let validationMessage = "Can only contain Alpha characters"
}
class AlphaNumericValidation: TextValidation {
static let sharedInstance = AlphaNumericValidation()
private init() {}
let regExFindMatchString = "^[a-zA-Z0-9]{0,15}"
let validationMessage = "Can only contain Alpha Numeric characters"
}
class DisplayNameValidation: TextValidation {
static let sharedInstance = DisplayNameValidation()
private init() {}
let regExFindMatchString = "^[\\s?[a-zA-Z0-9\\-_\\s]]{0,15}"
let validationMessage = "Display Name can contain Alphanumeric Characters"
}
var myString1 = "abcxyz"
var myString2 = "abc123"
var validation = AlphabeticValidation.sharedInstance
print(validation.validateString(str: myString1))
print(validation.validateString(str: myString2))
print(validation.getMatchingString(str: myString1))
print(validation.getMatchingString(str: myString2))
/// 표준 라이브러리 확장
extension Int {
func factorial() -> Int {
var answer = 1
for x in (1...self).reversed() {
answer *= x
}
return answer
}
}
print(10.factorial())
/// Equatable
struct Place {
let id: String
let latitude: Double
let longitude: Double
}
extension Place: Equatable {
static func == (lhs: Place, rhs: Place) -> Bool {
return lhs.id == rhs.id &&
lhs.latitude == rhs.latitude &&
lhs.longitude == rhs.longitude
}
}
var placeOne = Place(id: "Fenway Park", latitude: 42.3467, longitude: -71.0972)
var placeTwo = Place(id: "Wrigley Field", latitude: 41.9484, longitude: -87.6553)
print(placeOne == placeTwo)