Sets.md

Set

• Declaration

var numbers : Set = [0,2,4,6,8,1,3,5,7,9]
var languages : Set = ["C","Objective-C","C++"]
var odd : Set<Int> = [1,3,5,7,9]
var even : Set<Int> = [0,2,4,6,8]
var prime : Set<Int> = [2,3,5,7]

var numbers : Set<Int> = []
var languages : Set<String> = []

Methods

• Count

languages.count()

3

• Is Empty

numbers.isEmpty

false

• Insert

languages.insert("Swift")

["Objective-C", "C", "C++", "Swift"]

• Remove

languages.remove("Swift")

["Objective-C", "C", "C++"]

• Remove All

languages.removeAll()

[]

• Remove First

languages.removeFirst()

["C++", "C"]

• Update

numbers.update(with: 10)

[9, 6, 3, 8, 2, 7, 10, 1, 0, 4, 5]

• Maximum

numbers.max()

9

• Minimum

numbers.min()

0

• Sorted

numbers.sorted(by: >)

[9, 8, 7, 6, 5, 4, 3, 2, 1, 0]

numbers.sorted(by: <)

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

• Shuffled

numbers.shuffled()

[8, 5, 0, 3, 6, 2, 9, 7, 4, 1]

• Filter

numbers.filter({$0>5})

[8, 9, 6, 7]

languages.filter({$0.hasPrefix("C")})

["C", "C++"]

• A∪B

var union = odd.union(even)

[2, 9, 4, 3, 5, 1, 7, 6, 0, 8]

• A∩B

var intersection = odd.intersection(prime)

[5, 3, 7]

• A\B

var subtracting = odd.subtracting(prime)

[1,9]

• (A\B)∪(B\A)

var symmetricDifference = odd.symmetricDifference(prime)

[1, 2, 9]

• B⊂A

var subset = even.isSubset(of: numbers)

true

• A⊃B

var superset = numbers.isSuperset(of: even)

true