This document summarizes Swift collection types including arrays, sets, and dictionaries. It provides examples of initializing and manipulating each collection type through actions like inserting and removing items. Key points covered include declaring and initializing each type, accessing and modifying items, and common operations like union, intersection and iteration.

1. Swift 3 : Collection
군산대학교 컴퓨터정보통신공학부 컴퓨터정보공학전공
남 광 우
kwnam@kunsan.ac.kr
Swift 3 Tour and Language Guide by Apple

2. Collections
• Collection Types
• Array, Set, Dictionary
• Array 도 클래스 객체
• C : int arr[5]
• Swift : var arr = Array<Int>( repeating : 0, count:5 )

3. Array
• Array의 선언
• Array 변수의 선언 1
• 빈 Array 변수의 선언 2
• 빈 Array 변수의 선언 3
C : int[] arrInt;
var arrInt : Array<Int> ;
arrInt = Array();
C : int[] arrInt;
var arrInt : [Int];
arrInt = [Int]();
C : int arrInt[5];
var arrInt = Array<Int>( repeating : 0, count:5 );
C : double arrDbl[3];
var arrDbl = Array( repeating:0.0, count:3);

4. var arrInt: Array<Int> = [3, 4];
var arrInt: [Int] = [3, 4];
• Array의 선언과 초기화
• Array<Int> 형
• [Int] 형
• 예 : String 배열의 선언과 초기화
• 예 : type의 생략
var shoppingList : [String] = [“Eggs”, “Milk”];
var shoppingList = [“Eggs”, “Milk”];
Array

5. • Array에 데이터 넣기
• Array<Int>(repeating:0, count:0) 로 선언한 경우
• 예 : 배열 데이터 수정과 내용 출력
• Range를 이용한 갱신
arr[2] = 1;
arr[2…3] = [5,5];
Array
Swift2 : (count:5, repeatedValue:0)

6. • Array에 데이터 넣기
• 다음과 같이 빈 Array를 생성한 경우
• 데이터 추가
• empty array 할당
var arrInt : Array<Int> ;
arrInt = Array();
var arrInt : [Int];
arrInt = [Int]();
arrInt.append(3);
arrInt = [];
arrInt += [3] ;
shoppingList.append(“Flour”);
shoppingList += [“Flour”];
Array

7. • Array에 데이터 삽입과 삭제
• 데이터 삽입하기
• 데이터 삭제하기
arrInt.insert( 5, at : 0 );
arrInt.remove( at : 4 );
arrInt.removeLast( );
Array
Swift2

8. • isEmpty
• Array 의 empty 상태 파악하기
• enumerated
• ( index, value) tuple 형태로 enumeration
if arrInt.isEmpty {
print( “empty”);
}
for (index, value) in shoppingList.enumerated()
{
print("Item (index + 1): (value)")
}
Array

9. Set
var letters = Set<Character>()
print("letters is of type Set<Character> with (letters.count) items.")
// Prints "letters is of type Set<Character> with 0 items."
• Set의 생성
• Set에 데이터 넣기
letters.insert("a")
// letters now contains 1 value of type Character
letters = []
// letters is now an empty set, but is still of type Set<Character>

10. Set
• Set 변수와 초기화
• Set 초기화
// letters is now an empty set, but is still of type Set<Character>
var favoriteGenres: Set<String> = ["Rock", "Classical", "Hip hop"]
// favoriteGenres has been initialized with three initial items
var favoriteGenres: Set = ["Rock", "Classical", "Hip hop"]

11. Set
• Set 개수 세기
• isEmpty
print("I have (favoriteGenres.count) favorite music genres.")
// Prints "I have 3 favorite music genres.
if favoriteGenres.isEmpty {
print("As far as music goes, I'm not picky.")
} else {
print("I have particular music preferences.")
}
// Prints "I have particular music preferences."

12. • Set 삽입과 삭제
• contains
favoriteGenres.insert("Jazz")
// favoriteGenres now contains 4 items
if let removedGenre =
favoriteGenres.remove("Rock") {
print("(removedGenre)? I'm over it.")
} else {
print("I never much cared for that.")
}
if favoriteGenres.contains("Funk") {
print("I get up on the good foot.")
} else {
print("It's too funky in here.")
}
// Prints "It's too funky in here."
Set

13. • Set in For‐Loop
for genre in favoriteGenres {
print("(genre)")
}
// Jazz
// Hip hop
// Classical
for genre in favoriteGenres.sorted() {
print("(genre)")
}
// Classical
// Hip hop
// Jazz
Set

14. • Set Operation
Set

15. • Set Operation
let oddDigits: Set = [1, 3, 5, 7, 9]
let evenDigits: Set = [0, 2, 4, 6, 8]
let singleDigitPrimeNumbers: Set = [2, 3, 5, 7]
oddDigits.union(evenDigits).sorted()
// [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
oddDigits.intersection(evenDigits).sorted()
// []
oddDigits.subtracting(singleDigitPrimeNumbers).sorted()
// [1, 9]
oddDigits.symmetricDifference(singleDigitPrimeNumbers).sorted()
// [1, 2, 9]
Set

16. • Set Operation
let houseAnimals: Set = ["🐶", "🐱"]
let farmAnimals: Set = ["🐮", "🐔", "🐑", "🐶", "🐱"]
let cityAnimals: Set = ["🐦", "🐭"]
houseAnimals.isSubset(of: farmAnimals)
// true
farmAnimals.isSuperset(of: houseAnimals)
// true
farmAnimals.isDisjoint(with: cityAnimals)
// true
Set

17. Dictionary
• Dictionary 생성
• Dictionary에 값 넣고 출력하기
var namesOfIntegers = [Int: String]()
// namesOfIntegers is an empty [Int: String] dictionary
nameOfIntegers[3] = "three";
for i in nameOfIntegers
{
print( "(i.0) (i.1) " );
}

18. Dictionary
• Dictionary 생성과 초기화
• type 없는 생성
var airports: [String: String] = ["YYZ": "Toronto Pearson", "DUB": "Dublin"]
var airports = ["YYZ": "Toronto Pearson", "DUB": "Dublin"]

19. Dictionary
• 데이터 갱신
• 데이터 삭제
if let oldValue = airports.updateValue("Dublin Airport", forKey: "DUB") {
print("The old value for DUB was (oldValue).")
}
// Prints "The old value for DUB was Dublin."
if let removedValue = airports.removeValue(forKey: "DUB") {
print("The removed airport's name is (removedValue).")
} else {
print("The airports dictionary does not contain a value for DUB.")
}
// Prints "The removed airport's name is Dublin Airport."

20. Dictionary
• Iterating (key, value ) tuple
• key의 enumeration
for (airportCode, airportName) in airports {
print("(airportCode): (airportName)")
}
// YYZ: Toronto Pearson
// LHR: London Heathrow
for airportCode in airports.keys {
print("Airport code: (airportCode)")
}
// Airport code: YYZ
// Airport code: LHR
for airportName in airports.values {
print("Airport name: (airportName)")
}
// Airport name: Toronto Pearson
// Airport name: London Heathrow

21. Dictionary
• key 또는 value의 array 만들기
let airportCodes = [String](airports.keys)
// airportCodes is ["YYZ", "LHR"]
let airportNames = [String](airports.values)
// airportNames is ["Toronto Pearson", "London Heathrow"]

22. 실습
• Mac OS X 용으로 컴파일 하기

23. 실습

24. 실습
• 컴파일된 Mac OS X 용 실행 파일 만들기
• 실행
• 실행 파일의 위치
• /Users/사용자이름/Library/Developer/
Xcode/DerivedData/프로젝트이름
/Build/Products/Debug
print( “name“);
var name = readLine();
print( “Hello (name!)~~~“);