Swift - 혼자 공부하면 분명히 안할테니까 같이 공부하기

4XJGU ഒ੗ҕࠗೞݶ࠙ݺ൤ উೡపפөэ੉ҕࠗೞӝ ੹ࣻৌ HJUIVCDPNEFWYPVM

੹ࣻৌ ↟ ࣗ೐౟ਝয݃ীझ౟۽ӝ ↟ 4UZMF4IBSFীࢲJ04઱۽ѐߊ ↟ J04ѐߊ਷ড֙૩ ↟ 4XJGUҕѐػզࠗఠࢎਊೞӝद੘ ↟
4XJGUয়೑ࣗझഝزਸৌब൤ೞחࢎۈ

↟ গ೒ীࢲ݅ٚӘࣻ੷঱য ↟ 0QFO4PVSDF ↟ 4UBDL0WFSGMPXо੢ࢎی߉ח ঱যਤ

୹୊IUUQTUBDLPWFSGMPXDPNSFTFBSDIEFWFMPQFSTVSWFZ

4XJGU੄৉ࢎ

↟ ૣ਺ ↟ ੗઱߄Պ ֙݃׮.BKPSসؘ੉౟ ↟ അ੤9DPEFীನೣػߡ੹਷
↟ ৢ೧оਸী4XJGUܾܻૉ৘੿ 4XJGU੄৉ࢎ

4XJGUӝୡޙߨ

߸ࣻ৬࢚ࣻ // ߸ࣻ var name = "Suyeol Jeon" // ࢚ࣻ
let birthyear = 1995

// ߸ࣻח ч ߸҃ оמ NVUBCMF name = "੹ࣻৌ" //
࢚ࣻחч߸҃ࠛоמ JNNVUBCMF birthyear = 2000 ! Cannot assign to value: 'birthyear' is a 'let' constant ۠ఋ੐੉ইצஹ౵ੌఋ੐ী୓௼ؽ ߸ࣻ৬࢚ࣻ

var name: String = "Suyeol Jeon" let birthyear: Int =
1995 var height: Float = 180.1 ੿੸ఋ੉ೝ 4UBUJD5ZQJOH ঱য ߸ࣻ৬࢚ࣻ ↟ ஹ౵ੌఋ੐ী߸ࣻ੄੗ܐഋਸঌইঠೠ׮ ↟ ೠߣࢶ঱ػ੗ܐഋ਷߄Շ૑ঋח׮

var name: String = "Suyeol Jeon" let birthyear: Int =
1995 var height: Float = 180.1 ↟ "ABC"חString੉׮ ↟ 123਷Int׮ ↟ ஹ౵ੌఋ੐ী߸ࣻ੄੗ܐഋਸ୶ஏ ߸ࣻ৬࢚ࣻ ఋੑ୶ۿ 5ZQF*OGFSFODF ࢤۚ ࢤۚ ࢤۚ

߸ࣻ৬࢚ࣻ ߓৌ "SSBZ җ٤࣊ցܻ %JDUJPOBSZ [String] [String: String] let languages
= [ "Swift", "Objective-C", "Python", ] var capitals = [ "ೠҴ": "ࢲ਎", "ੌࠄ": "ب௡", "઺Ҵ": "߬੉૚", ]

ઑѤޙҗ߈ࠂޙ ↟ if for switchо׼ো൤ઓ੤ ↟ ಁఢݒட੉оמ ↟ Қഐܳউॄبؽ ઁੌજ਷ӝמ

ઑѤޙҗ߈ࠂޙ for _ in 0..<10 { print("Hello!") } ױࣽೠ߈ࠂޙ •
for i in 0..<10ܳࢎਊೞݶ  iܳࢎਊೞ૑ঋও׮Ҋஹ౵ੌ۞҃Ҋ • @ܳࢎਊೞݶчਸࢎਊೞ૑ঋҊޖद

ઑѤޙҗ߈ࠂޙ switch age { case 8..<14: student = "ୡ١೟ࢤ" case
14..<17: student = "઺೟ࢤ" case 17..<20: student = "Ҋ١೟ࢤ" default: student = "ӝఋ" } ಁఢݒட

২࣊օ 0QUJPOBM ↟ 4XJGUоо૑Ҋ੓חо੢௾ౠ૚઺ೞա ↟ ч੉੓ਸࣻب੓Ҋহਸࣻب੓Ҋ

২࣊օ 0QUJPOBM ޙ੗ৌ੄ч੉੓׮ݶ ޙ੗ৌ੄ч੉হ׮ݶ "оա׮"

২࣊օ 0QUJPOBM ޙ੗ৌ੄ч੉੓׮ݶ ޙ੗ৌ੄ч੉হ׮ݶ "оա׮" "" // ?

২࣊օ 0QUJPOBM ޙ੗ৌ੄ч੉੓׮ݶ ޙ੗ৌ੄ч੉হ׮ݶ "оա׮" "" // ? ࠼ч

২࣊օ 0QUJPOBM ޙ੗ৌ੄ч੉੓׮ݶ ޙ੗ৌ੄ч੉হ׮ݶ "оա׮" nil // ੿׹

২࣊օ 0QUJPOBM ੿ࣻ੄ч੉੓׮ݶ ੿ࣻ੄ч੉হ׮ݶ 123 0 // ڀ nil
// ੿׹

২࣊օ 0QUJPOBM var name: String = "੹ࣻৌ" name = nil
! Nil cannot be assigned to type 'String' ӒրStringীחnilਸ֍ਸࣻহ׮

২࣊օ 0QUJPOBM var name: String? = "੹ࣻৌ" name = nil
?ܳࠢৈࢲStringਸ২࣊օ۽੿੄೧ঠೠ׮ ч੉੓ਸࣻب੓Ҋ ч੉হਸࣻب੓Ҋ

২࣊օ 0QUJPOBM ২࣊օ੄ୡӥч਷nil var email: String? print(email) // nil email
= "[email protected]" print(email) // Optional("dev...com")

২࣊օ 0QUJPOBM String?਷String੉ইפ׮ let optional: String? = "Hello" let required:
String = optional ! Value of optional type 'String?' not unwrapped; did you mean to use '!' or '?'?

২࣊օ 0QUJPOBM String?਷String੉ইפ׮ чਸޖઑѤ  оઉঠೣ чਸо૑૑  ঋইبؽ ನೣ String String?

২࣊օ 0QUJPOBM 0QUJPOBM যڃч "A" 10 nil ২࣊օযڃчژחOJMਸо૕ࣻ੓ח੗ܐഋ

২࣊օ 0QUJPOBM ২࣊օ߄ੋ٬ 0QUJPOBM#JOEJOH ↟ ২࣊օউী੓חчਸоઉয়חߑߨ ↟ ২࣊օਸ׮ܲ߸ࣻী߄ੋ٬ ↟ ч੉੓׮ݶઁযޙউਵ۽
হ׮ݶ߆ਵ۽

২࣊օ 0QUJPOBM ২࣊օ߄ੋ٬ 0QUJPOBM#JOEJOH let optionalName: String? = "੹ࣻৌ" if
let name = optionalName { print(name) } ч੉ઓ੤ೞח҃਋

let name = optionalName { print(name) } ч੉ઓ੤ೞח҃਋ "੹ࣻৌ" पઁч

let name = optionalName { print(name) } ч੉ઓ੤ೞח҃਋ let name: String = "੹ࣻৌ" ਃۧѱࢶ঱ೠѪҗэ਷࢚కоؽ

let name = optionalName { print(name) // ੹ࣻৌ } ч੉ઓ੤ೞח҃਋

২࣊օ 0QUJPOBM ২࣊օ߄ੋ٬ 0QUJPOBM#JOEJOH let optionalName: String? if let name
= optionalName { print(name) } ч੉ઓ੤ೞ૑ঋח҃਋

= optionalName { print(name) } ч੉ઓ੤ೞ૑ঋח҃਋ nil

= optionalName { print(name) } ч੉ઓ੤ೞ૑ঋח҃਋ ઁযޙਸӒրѤցڭ

২࣊օ 0QUJPOBM ২࣊օ߄ੋ٬ 0QUJPOBM#JOEJOH if let name = optionalName, let
age = optionalAge { print(name, age) } ৈ۞ѐ੄0QUJPOBM߄ੋ٬بоמ

২࣊օ 0QUJPOBM ২࣊օ߄ੋ٬ 0QUJPOBM#JOEJOH if let age = optionalAge where
age >= 20 { print(age) } ↟ whereܳࢎਊೠઑѤ૑੿ ↟ ২࣊օ੉ߩѹ૓чਸࢎਊоמ

২࣊օ 0QUJPOBM ২࣊օ୓੉׬ 0QUJPOBM$IBJOJOH ੉ޙߨਸঌѱػ੉റ۽  1ZUIPO੉ ઑӘ ࠛಞೞѱוԑ૗

২࣊օ 0QUJPOBM ২࣊օ୓੉׬ 0QUJPOBM$IBJOJOH if let arr = optionalArray {
print(arr.isEmpty) } else { print(false) } ߓৌীч੉ઓ੤ೞח૑୹۱ೞӝ

২࣊օ 0QUJPOBM ২࣊օ୓੉׬ 0QUJPOBM$IBJOJOH print(optionalArray?.isEmpty == true) ߓৌীч੉ઓ੤ೞח૑୹۱ೞӝ

২࣊օ 0QUJPOBM ২࣊օ୓੉׬ 0QUJPOBM$IBJOJOH print(optionalArray?.isEmpty == true) ߓৌীч੉ઓ੤ೞח૑୹۱ೞӝ OJM੉ইצ҃਋

২࣊օ 0QUJPOBM ২࣊օ୓੉׬ 0QUJPOBM$IBJOJOH print(optionalArray?.isEmpty == true) ߓৌীч੉ઓ੤ೞח૑୹۱ೞӝ OJMੋ҃਋

২࣊օ 0QUJPOBM ২࣊օ୓੉׬ 0QUJPOBM$IBJOJOH print(optionalArray?.isEmpty == true) ߓৌীч੉ઓ੤ೞח૑୹۱ೞӝ OJMੋ҃਋ ׮਺ਵ۽୓੉׬غ૑ঋҊѤցڭ

২࣊օ 0QUJPOBM ২࣊օߩӝӝ 6OXSBQ let optionalName: String? = "੹ࣻৌ" print(optionalName)
// Optional("੹ࣻৌ") print(optionalName!) // ੹ࣻৌ ܳࢎਊ೧ࢲъઁ۽২࣊օ੄чਸԁղৡ׮

২࣊օ 0QUJPOBM ২࣊օߩӝӝ 6OXSBQ ↟ ч੉হחؘԁղয়ݶ۠ఋ੐ী$SBTIߊࢤ ↟ ࠺ਬೞ੗ݶ+BWB੄/VMM1PJOUFS&YDFQUJPO ↟ оמೞݶউॳחѱજ׮
গ೒ӂ੢

২࣊օ 0QUJPOBM ঐޗ੸ਵ۽ߩѹ૓২࣊օ *NQMJDJUMZ6OXSBQQFE0QUJPOBM var email: String! = "੹ࣻৌ" print(email)
// ੹ࣻৌ ↟ ч੉੓׮Ҋо੿ೞח২࣊օ ↟ 0QUJPOBM#JOEJOHহ੉чী૒੽੽Ӕоמ ↟ оઉ৳חؘnil੉ۄݶ$SBTI উॳחѱજ׮

ೣࣻ৬௿۽੷ $MPTVSF func hello(name: String, time: Int) -> String {
var string = "" for _ in 0..<time { string += "\(name)ש উ֞ೞࣁਃ!\n" } return string } ೣࣻ੿੄

var string = "" for _ in 0..<time { string += "\(name)ש উ֞ೞࣁਃ!\n" } return string } hello("੹ࣻৌ", time: 3) ೣࣻ੿੄

var string = "" for _ in 0..<time { string += "\(name)ש উ֞ೞࣁਃ!\n" } return string } hello("੹ࣻৌ", time: 3) ୐ߣ૩חࢤۚ 4XJGUীࢲח೙ਃ Oߣ૩ח౵ۄ޷ఠ੉ܴ੘ࢿ ୐ߣ૩ੋ੗ Oߣ૩ੋ੗ O ೣࣻ੿੄

ೣࣻ৬௿۽੷ $MPTVSF func hello(name: String, numberOfTimes time: Int) -> Void
{ print(time) } hello("੹ࣻৌ", numberOfTimes: 3) ౵ۄ޷ఠ੉ܴ૑੿ೞӝ

ೣࣻ৬௿۽੷ $MPTVSF func hello(name: String, numberOfTimes time: Int) -> Void
{ print(time) } hello("੹ࣻৌ", numberOfTimes: 3) ೣࣻഐ୹दࢎਊೞח੉ܴ ղࠗীࢲࢎਊೞח੉ܴ ౵ۄ޷ఠ੉ܴ૑੿ೞӝ

ೣࣻ৬௿۽੷ $MPTVSF func hello(withName name: String, numberOfTimes time: Int) ->
Void { print(time) } hello(withName: "੹ࣻৌ", numberOfTimes: 3) ୐ߣ૩౵ۄ޷ఠ੉ܴ૑੿ೞӝ

ೣࣻ৬௿۽੷ $MPTVSF func hello(name: String, _ time: Int) -> Void
{ print(time) } hello("੹ࣻৌ", 3) ౵ۄ޷ఠ੉ܴࢤۚೞӝ

ೣࣻ৬௿۽੷ $MPTVSF func hello(name: String, time: Int = 1) ->
Void { print(time) } hello("੹ࣻৌ") ౵ۄ޷ఠӝࠄч૑੿ೞӝ

ೣࣻ৬௿۽੷ $MPTVSF func sum(numbers: Int...) -> Int { var sum
= 0 for number in numbers { sum += number } return sum } sum(1, 2) sum(3, 4, 5) о߸ഋੋ੗

ೣࣻ৬௿۽੷ $MPTVSF func hello(name: String, time: Int) { func message(name:
String) { return "\(name)ש উ֞ೞࣁਃ!" } for _ in 0..<time { print message(name) } } ೣࣻউীೣࣻ੿੄ೞӝ ઺୏ೣࣻ

ೣࣻ৬௿۽੷ $MPTVSF func helloGenerator(message: String) -> String -> String {
func hello(name: String) -> String { return name + message } return hello } let hello = helloGenerator("ש উ֞ೞࣁਃ!") hello("੹ࣻৌ") ೣࣻীࢲೣࣻ߈ജೞӝ 4USJOHਸ߉ইࢲ4USJOHਸ߈ജೞחޖ঱о ܳ߈ജೞѷ׮

ೣࣻ৬௿۽੷ $MPTVSF func helloGenerator(message: String) -> String -> String {
func hello(name: String) -> String { return name + message } return hello } let hello = helloGenerator("ש উ֞ೞࣁਃ!") hello("੹ࣻৌ") ೣࣻীࢲೣࣻ߈ജೞӝ

ೣࣻ৬௿۽੷ $MPTVSF func helloGenerator(message: String) -> (String, String) -> String
{ func hello(firstName: String, lastName: String) -> String { return lastName + firstName + message } return hello } let hello = helloGenerator("ש উ֞ೞࣁਃ!") hello("ࣻৌ", "੹") ೣࣻীࢲೣࣻ߈ജೞӝ 4USJOHفѐܳ߉ইࢲ4USJOHਸ߈ജೞחޖ঱о ܳ߈ജೞѷ׮

{ func hello(firstName: String, lastName: String) -> String { return lastName + firstName + message } return hello } let hello = helloGenerator("ש উ֞ೞࣁਃ!") hello("ࣻৌ", "੹") ೣࣻীࢲೣࣻ߈ജೞӝ

{ return { (firstName: String, lastName: String) -> String in return lastName + firstName + message } } ೣࣻীࢲ௿۽੷߈ജೞӝ func helloGenerator(message: String) -> (String, String) -> String { func hello(firstName: String, lastName: String) -> String { return lastName + firstName + message } return hello } ೣࣻח੉ܴ੉੓ח௿۽੷

{ return { (firstName: String, lastName: String) -> String in return lastName + firstName + message } } ௿۽੷рѾೞѱٜ݅ӝ

{ return { (firstName: String, lastName: String) -> String in return lastName + firstName + message } } ௿۽੷рѾೞѱٜ݅ӝ ೣࣻ੿੄ীࢲ௿۽੷੄੗ܐഋਸঌҊ੓֎

{ return { firstName , lastName in return lastName + firstName + message } } ௿۽੷рѾೞѱٜ݅ӝ ೣࣻ੿੄ীࢲ௿۽੷੄੗ܐഋਸঌҊ੓֎ ࢤۚ

{ return { firstName, lastName in return lastName + firstName + message } } ௿۽੷рѾೞѱٜ݅ӝ ೣࣻ੿੄ীࢲ௿۽੷੄੗ܐഋਸঌҊ੓֎ ࢤۚ

{ return { firstName, lastName in return lastName + firstName + message } } ௿۽੷рѾೞѱٜ݅ӝ ௿۽੷౵ۄ޷ఠࣽࢲܳঌҊ੓֎

{ return { return $1 + $0 + message } } ௿۽੷рѾೞѱٜ݅ӝ ௿۽੷౵ۄ޷ఠࣽࢲܳঌҊ੓֎ ࢤۚ ߣ౵ۄ޷ఠ ߣ౵ۄ޷ఠ

{ return { return $1 + $0 + message } } ௿۽੷рѾೞѱٜ݅ӝ ௿۽੷౵ۄ޷ఠࣽࢲܳঌҊ੓֎ ࢤۚ

{ return { $1 + $0 + message } } ௿۽੷рѾೞѱٜ݅ӝ ब૑য҃਋ীٮۄSFUVSOبࢤۚೡࣻ੓਺ func helloGenerator(message: String) -> (String, String) -> String { return { return $1 + $0 + message } }

ೣࣻ৬௿۽੷ $MPTVSF ௿۽੷߸ࣻ੿੄ೞӝ let hello: (String, String) -> String =
{ $1 + $0 + "ש উ֞ೞࣁਃ!" } hello("ࣻৌ", "੹")

ೣࣻ৬௿۽੷ $MPTVSF let hello: ((String, String) -> String)? = nil
hello?("ࣻৌ", "੹") ২࣊օ۽੿੄೧ࢲ২࣊օ୓੉׬ೞӝ

ೣࣻ৬௿۽੷ $MPTVSF func manipulateNumber(number: Int, usingBlock block: Int -> Int)
-> Int { return block(number) } manipulateNumber(10, usingBlock: { (number: Int) -> Int in return number * 2 }) ௿۽੷ܳೣࣻ౵ۄ޷ఠ۽߉ӝ

ೣࣻ৬௿۽੷ $MPTVSF manipulateNumber(10, usingBlock: { $0 * 2 }) ௿۽੷ܳೣࣻ౵ۄ޷ఠ۽߉ӝ
݃ଲо૑۽ࢤۚоמ manipulateNumber(10, usingBlock: { (number: Int) -> Int in return number * 2 }) manipulateNumber(10) { $0 * 2 } ೣࣻ੄݃૑݄౵ۄ޷ఠо ௿۽੷ੋ҃਋੉ܴҗҚഐࢤۚоמ

ೣࣻ৬௿۽੷ $MPTVSF ௿۽੷ܳೣࣻ౵ۄ޷ఠ۽߉ӝ let numbers = [1, 3, 2, 6,
7, 5, 8, 4] let sortedNumbers = numbers.sort { $0 < $1 } print(sortedNumbers) // [1, 2, 3, 4, 5, 6, 7, 8] let evens = numbers.filter { $0 % 2 == 0 } print(evens) // [2, 6, 8, 4] ৘दTPSU ৬GJMUFS

ೣࣻ৬௿۽੷ $MPTVSF ௿۽੷ഝਊೞӝNBQ let arr1 = [1, 3, 6, 2,
7, 9] let arr2 = arr1.map { $0 * 2 } // [2, 6, 12, 4, 14, 18]

ೣࣻ৬௿۽੷ $MPTVSF ௿۽੷ഝਊೞӝSFEVDF let arr1 = [1, 3, 6, 2,
7, 9] arr1.reduce(0, combine: { $0 + $1 }) // 28

7, 9] arr1.reduce(0, combine: { $0 + $1 }) // 28 0 1 +

7, 9] arr1.reduce(0, combine: { $0 + $1 }) // 28 0 1 + = 1

7, 9] arr1.reduce(0, combine: { $0 + $1 }) // 28 1 3 0 1 + = 1 +

7, 9] arr1.reduce(0, combine: { $0 + $1 }) // 28 1 3 0 1 + = 1 + = 4

7, 9] arr1.reduce(0, combine: { $0 + $1 }) // 28 1 3 0 1 + = 1 + = 4 4 6 +

7, 9] arr1.reduce(0, combine: { $0 + $1 }) // 28 1 3 0 1 + = 1 + = 4 4 6 + = 10

7, 9] arr1.reduce(0, combine: { $0 + $1 }) // 28 1 3 0 1 + = 1 + = 4 4 6 + = 10 ߈ࠂ

7, 9] arr1.reduce(0, combine: +) // 28 ౲ো࢑੗بೣࣻ׮

௿ېझ৬ҳઑ୓ ௿ېझ ҳઑ୓ class Dog { var name: String? var
age: Int? func simpleDescription() -> String { return "" \(self.name)" } } struct Coffee { var name: String? var size: String? func simpleDescription() -> String { return "☕ \(self.name)" } }

௿ېझ৬ҳઑ୓ ௿ېझ ҳઑ୓ ࢚ࣘоמ ࢚ࣘࠛоמ ଵઑ 3FGFSFODF ࠂࢎ $PQZ

௿ېझ৬ҳઑ୓ ࢤࢿ੗ class Dog { var name: String? var age:
Int? init() { self.age = 0 // ࣘࢿ ୡӝച } }

௿ېझ৬ҳઑ୓ ࢤࢿ੗ class Dog { var name: String // ч੉
ޖઑѤ ೙ਃ var age: Int? init() { self.age = 0 } } ч੉೙ਃೠࣘࢿ੉ୡӝചغ૑ঋ਷҃਋ஹ౵ੌী۞ ! Return from initializer without initializing all stored properties

௿ېझ৬ҳઑ୓ ࢤࢿ੗ class Dog { var name: String = "੹ࣻৌ"
var age: Int? init() { self.age = 0 } } ࣘࢿਸ੿੄ೡٸୡӝച೧઱Ѣա

௿ېझ৬ҳઑ୓ ௿ېझ࢚ࣘ class Dog: Animal { var name: String? var
age: Int override init() { self.age = 0 // ୡӥч ࢸ੿ super.init() // ࢚ਤ ௿ېझ ࢤࢿ੗ ഐ୹ // ৈӝࢲࠗఠ `self` ੽Ӕ оמ print(self.simpleDescription()) } func simpleDescription() -> String { return "" \(self.name)" } }

௿ېझ৬ҳઑ୓ ࣘࢿ 1SPQFSUZ 4UPSFE1SPQFSUZपઁч੉੷੢ػࣘࢿ $PNQVUFE1SPQFSUZ҅࢑ਸా೧߈ജغחࣘࢿ

௿ېझ৬ҳઑ୓ 4UPSFE1SPQFSUZ struct Hex { var decimal: Int? }

௿ېझ৬ҳઑ୓ $PNQVUFE1SPQFSUZ struct Hex { var hexString: String? { get
{ if let decimal = self.decimal { return String(decimal, radix: 16) } else { return nil } } set { if let newValue = newValue { self.decimal = Int(newValue, radix: 16) } else { self.decimal = nil } } } } HFUҗTFU

௿ېझ৬ҳઑ୓ ੍ӝ੹ਊࣘࢿ struct Hex { var hexCode: String? { if
let hex = self.hexString { return "0x" + hex } return nil } } HFUఃਕ٘ࢤۚоמ

௿ېझ৬ҳઑ୓ 4UPSFE1SPQFSUZ੄ࣘࢿҙ଴ೞӝ EJE4FUҗXJMM4FU struct Hex { var decimal: Int? {
willSet { print("\(self.decimal)ীࢲ \(newValue)۽ ч੉ ߄Չ ৘੿ੑפ׮.") } didSet { print("\(oldValue)ীࢲ \(self.decimal)۽ ч੉ ߄Շ঻णפ׮.") } } }

ౚ೒ 5VQMF ↟ যځೠчٜ੄ޘ਺ ↟ Ҋ੿ػӡ੉ ୶оઁѢೡࣻহ਺ ↟ ஹ౵ੌఋ੐ী੗ܐഋ੉੿೧૗
var coffeeInfo = ("ইݫܻ஠֢", 5100) coffeeInfo // (String, Int) coffeeInfo.0 // ইݫܻ஠֢ coffeeInfo.1 // 5100 coffeeInfo.1 = 5100

ౚ೒ 5VQMF var namedCoffeeInfo = (coffee: "ইݫܻ஠֢", price: 5100) namedCoffeeInfo.coffee
// ইݫܻ஠֢ namedCoffeeInfo.price // 5100 namedCoffeeInfo.price = 5100 ౚ೒ী੉ܴࠢ੉ӝ ؀न౵ۄ޷ఠ੉ܴਵ۽੽Ӕоמ

ౚ೒ 5VQMF let (coffee, price) = ("ইݫܻ஠֢", 5100) coffee //
ইݫܻ஠֢ price // 5100 ౚ೒۽ৈ۞߸ࣻীч؀ੑೞӝ let (_, latteSize, lattePrice) = ("ۄڍ", "Venti", 5600) latteSize // Venti lattePrice // 5600

ౚ೒ 5VQMF func coffeeInfoForName(name: String) -> (name: String, price: Int)?
{ let coffeeInfoList: [(name: String, price: Int)] = [ ("ইݫܻ஠֢", 5100), ("ۄڍ", 5600), ] for coffeeInfo in coffeeInfoList { if coffeeInfo.name == name { return coffeeInfo } } return nil } coffeeInfoForName("ইݫܻ஠֢")?.price // 5100 coffeeInfoForName("ীझ೐ۨࣗ")?.price // nil ౚ೒ਸ߈ജೞחೣࣻ

ৌѢഋ &OVN &OVN੿੄ೞӝ enum Month: Int { case January =
1 case February case March case April case May case June case July case August case September case October case November case December } ↟ ਗदч 3BX7BMVF ਸо ૑ח&OVN ↟ пп੄DBTFоࠗఠө ૑ܳо૗ 3BX5ZQF

ৌѢഋ &OVN &OVNীೣࣻ੿੄ೞӝ enum Month: Int { case ... func
simpleDescription() -> String { switch self { case .January: return "1ਘ" case .February: return "2ਘ" case ... return "..." case .December: return "12ਘ" } } }

ৌѢഋ &OVN &OVNࢎਊೞӝ let december = Month.December print(december.simpleDescription()) // 12ਘ
print(december.rawValue) // 12

ৌѢഋ &OVN 3BX7BMVF۽&OVNࢤࢿೞӝ let october = Month(rawValue: 10) print(october) //
Optional(Month.October) &OVNীࢲ੿੄غ૑ঋ਷ਗदчਸо૑Ҋࢤ ࢿೡ҃਋OJMਸ߈ജೞӝਤ೧0QUJPOBM

ৌѢഋ &OVN 4USJOHਸਗदчਵ۽о૑ח&OVN enum IssueState: String { case Open =
"open" case Closed = "closed" } let state = IssueState(rawValue: "open") print(state) // Optional(IssueState.Open)

ৌѢഋ &OVN ਗदчਸо૑૑ঋח&OVN enum Spoon { case Dirt case Bronze
case Silver case Gold } Ҷ੉೙ਃহח҃਋ࢎਊೞ૑ঋחѱ؊જणפ׮

ৌѢഋ &OVN &OVNఋੑ୶ۿ enum Spoon { case Dirt case Bronze
case Silver case Gold } let spoon: Spoon = .Gold func doSomething(spoon: Spoon) { // ... } doSomething(.Silver)

ৌѢഋ &OVN ੋ੗ܳо૑ח&OVN enum Error { case InvalidParameter(String, String) case
Timeout } let error = Error.InvalidParameter( "email", "੉ݫੌ ഋध੉ ৢ߄ܰ૑ ঋणפ׮." )

ৌѢഋ &OVN ੋ੗ܳо૑ח&OVN ੋ੗ԁղয়ӝ JGDBTF if case .InvalidParameter(let field, let
message) = error { print(field) // email print(message) // ੉ݫੌ ഋध੉ ৢ߄ܰ૑ ঋणפ׮. }

ৌѢഋ &OVN ੋ੗ܳо૑ח&OVN ੋ੗ԁղয়ӝ TXJUDIDBTF switch error { case .InvalidParameter(let
field, let message): print(field) // email print(message) // ੉ݫੌ ഋध੉ ৢ߄ܰ૑ ঋणפ׮. default: break }

ৌѢഋ &OVN ୽Ѻ੸ࢎप 0QUJPOBM਷ࢎप&OVN੉׮ public enum Optional<Wrapped> { case None
case Some(Wrapped) } OJM੉Ѣա чਸо૑ח҃਋оઓ੤ೞח&OVN

ৌѢഋ &OVN ୽Ѻ੸ࢎप let age: Int? = 20 switch age
{ case .None: // `nil`ੋ ҃਋ print("ա੉ ੿ࠁо হणפ׮.") case .Some(let x) where x < 20: print("୒ࣗ֙") case .Some(let x) where x < 65: print("ࢿੋ") default: print("যܰन") }

೐۽ష௒ 1SPUPDPM ↟ ೐۽ష௒਷ੋఠಕ੉झ৬࠺त ↟ ୭ࣗೠਵ۽оઉঠೡࣘࢿ੉աݫࢲ٘ܳ੿੄ ↟ पઁݫࢲ٘ী؀ೠҳഅ਷ೞ૑ঋ਺ /// ੹࣠оמೠ
ੋఠಕ੉झܳ ੿੄೤פ׮. protocol Sendable { var from: String? { get } var to: String { get } func send() }

೐۽ష௒ 1SPUPDPM struct Mail: Sendable { var from: String? var
to: String func send() { print("Send a mail from \(self.from) to \(self.to)") } } ೐۽ష௒੸ਊೞӝ ௿ېझ৬ҳઑ୓ী੸ਊоמ

೐۽ష௒ 1SPUPDPM func sendAnything<T: Sendable>(sendable: T) { sendable.send() } (FOFSJDҗѾ೤೧ࢲࢎਊೞӝ
4FOEBCMF੉੸ਊػఋੑ݅߉ਸࣻ੓חೣࣻ

೐۽ష௒ 1SPUPDPM ೐۽ష௒࢚ࣘ protocol Messagable { var message: String? {
get } } protocol Sendable: Messagable { // ... } 4FOEBCMFਸ੸ਊೞݶ.FTTBHBCMF਷੗ز੸ਊ

೐۽ష௒ 1SPUPDPM "OZ৬"OZ0CKFDU "OZחݽٚఋੑী؀਽ೞח೐۽ష௒ "OZ0CKFDUחݽٚଵઑఋੑী؀਽ೞח೐۽ష௒ let anyNumber: Any = 10
let anyString: Any = "Hi" let anyInstance: AnyObject = Dog()

੊झబ࣌ &YUFOTJPO ੉޷੿੄ػఋੑী࢜۽਍ࣘࢿ੉աݫࢲ٘ܳ ୶оೡࣻ੓ب۾ೞחӝמ extension String { var length: Int
{ return self.characters.count } func reverse() -> String { return self.characters.reverse() .map { String($0) } .joinWithSeparator("") } }

੊झబ࣌ &YUFOTJPO &YUFOTJPOਵ۽1SPUPDPMӝࠄҳഅೞӝ ↟ &YUFOTJPOਸࢎਊೞݶ೐۽ష௒ী  ӝࠄҳഅоמ ↟ 4UPSFE1SPQFSUZחࢎਊࠛо ↟ ݃஖௿ېझ࢚ࣘ୊ۢࢎਊೡࣻ੓਺
↟ ҳഅೞ૑ঋਵݶӝࠄҳഅਸࢎਊ ↟ 1SPUPDPM0SJFOUFE1SPHSBNNJOHਸ  оמೞѱೞח೨बӝמ

੊झబ࣌ &YUFOTJPO &YUFOTJPOਵ۽1SPUPDPMӝࠄҳഅೞӝ protocol Sendable { var from: String? {
get } var to: String { get } func send() } extension Sendable { func debug() { print("\(self.from) -> \(self.to)") } }

૕ޙ߉णפ׮

↟ EFWYPVM!HNBJMDPN ↟ IUUQTHJUIVCDPNEFWYPVM ↟ 5IF4XJGU1SPHSBNNJOH-BOHVBHF  IUUQTEFWFMPQFSBQQMFDPNMJCSBSZJPTEPDVNFOUBUJPO4XJGU $PODFQUVBM4XJGU@1SPHSBNNJOH@-BOHVBHF ↟ दр݅ী4XJGU۽J04জٜ݅ӝ 
IUUQTXXXHJUCPPLDPNCPPLEFWYPVMJPTXJUITXJGU JOIPVST хࢎ೤פ׮

Swift - 혼자 공부하면 분명히 안할테니까 같이 공부하기

Swift - 혼자 공부하면 분명히 안할테니까 같이 공부하기

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