swift 之 数组集合字典的简单使用

//: Playground - noun: a place where people can play

import UIKit

//有序集合

var str = "Hello, playground"

var array1: Array<Int> = Array<Int>()

var array2: [Int] = array1

var array3 = array2

array1.count

if array1.isEmpty{

    print("kong");

}

var fiveInts = [1,2,3,4,5]

fiveInts.count

fiveInts.append(6)

fiveInts += [7,8,9]

fiveInts.insert(0, atIndex: 0)

fiveInts.endIndex.predecessor()

fiveInts.startIndex.successor()

fiveInts[0]

fiveInts[0...1]

fiveInts[1...2]

fiveInts[0..<2]

fiveInts[0...1] = [0]

fiveInts

fiveInts.removeAtIndex(0)

fiveInts

for intvalue in fiveInts{

 print(intvalue)

}

fiveInts.enumerate()

for(index,value) in fiveInts.enumerate(){

 print("index--\(index),value---\(value)")

}

fiveInts.reverse()

//无序集合  set

let number = 10;

number.hashValue

let  pi = 3.14

pi.hashValue

let string = "swift"

string.hashValue

var  emptySet = Set<Character>()

emptySet = ["a","e","i","o","u"]

var  evenSet:Set = [2,4,6,8,10]

emptySet.isEmpty

emptySet.count

evenSet.insert(13)

evenSet.remove(13)

evenSet.contains(10)

for number in evenSet.sort(){

print(number)

}

//union join about set

var setA:Set = [1,2,3,4,5,6]

var setB:Set = [4,5,6,7,8,9]

//交集

let interSectAB: Set = setA.intersect(setB)//{5, 6, 4}

//补集

let exclusiveAB: Set =  setA.exclusiveOr(setB)//{9, 7, 2, 3, 1, 8}

let unionAB: Set = setA.union(setB)//{2, 4, 9, 5, 6, 7, 3, 1, 8}

let astructB : Set = setA.subtract(setB)//{2, 3, 1}

var setC: Set = [1,2,3]

if setA == setC{

    

}else{

    print("not equal")

}

setA.isSupersetOf(setC) //true

setC.isSubsetOf(setA) //true

setA.isStrictSupersetOf(setC) //true

setC.isStrictSubsetOf(setA) //true

setC.isStrictSubsetOf(setB) //false

setB.isDisjointWith(setC) //true

//dictionary

var int2String = [Int :String]()

int2String[10] = "TEN"

int2String[20] = "TWENTY"

int2String//[20: "TWENTY", 10: "TEN"]

int2String = [:]

var capitalNumber = [

    1:"one",

    2:"two",

    3:"three",

    4:"four",

    5:"five",

    6:"six",

    7:"seven",

    8:"eight",

    9:"nine",

    10:"ten"

]

capitalNumber[1]//"one"

capitalNumber[10]

capitalNumber.updateValue("一", forKey: 1)//"one"

capitalNumber

capitalNumber.count

var opiontalNine = capitalNumber.removeValueForKey(9)//"nine"

opiontalNine.dynamicType

for(key ,value ) in capitalNumber{

   print("\(key): \(value)")

}

for number in capitalNumber.keys{

  print(number)

}

capitalNumber.keys//LazyMapCollection, Int>

let keyArray = [Int](capitalNumber.keys)//[10, 2, 4, 5, 6, 7, 3, 1, 8]

let valueArray = [String](capitalNumber.values)//["ten", "two", "four", "five", "six", "seven", "three"