Swift Learning Note 5

Five, set

Array

1. Generic type array< >

2. Simplification [Type]

var myar:array<string>

var names:[string]

Myarr = array<string> ()

Names = array<string> (count:10,repeatedvalue: "Heri")

Nums = array<int> (count:100,repeatedvalue:0)

var values = ["2", "3", "4", "O"]

println (Names[1])

Name[0]= "Spring"

for Var i=0;i <values.count;i++

{
println (Values[i])

}

For V in Values

{
println (v)

}

adding elements

var languages = ["Swift"]

Languages.append ("Go")

Languages +=["Ruby"]

inserting elements

Languages.insert ("R", atindex:0)

Let SubRange = languages[1..<4]

LANGUAGES[2...4] = ["C + +", "PHP"]

Empty

Languages[0..<languages.count] = []

Delete

Languages.removeatindex (2)

Languages.removelast ()

Languages.removeall ()

Dictionary

1. Generic type

2. Simplifying

var mydict:dictionary<string,string>

var health:[string,string]

Constructors

Mydict = dictionary<string,string> ()

Health = ["height": "180", "Weight": "70", "blood pressure": "90/120"]

Read var height = health["height"]

var emptydict: [string:double]=[:]

health["Weight"]= 80

Add a new Key-value pair

var result = Health.updatevalue ("", Forkey: "Waist circumference")

Desc Default represents value

var seasons = ["Spring": "Spring Flowers", "Summer": "Summer scorching"]

for (SEASON,DESC) in seasons

{

println ("\ (season)-->\ (DESC)")

}

var keys = Array (Seasons.keys)

var values = Array (seasons.values)

Delete

var = ["Swift": Languages, "PHP": 340, "OC": 48]

Languages.removevalueforkey ("PHP")

languages["OC"]=nil

Languages.removeall ()

Practical example: Record the number of occurrences of each character in a string, and compare which one appears most

Let str = "Renhairui are a best man xhahahaxxxxx"

var status: [Character:int] =[:]

for ch in str

{

If Num!=nil

{

var num = status[ch]

Status[ch] = num! +1

}else{

Status[ch] = 1

}

}

println (status)

var maxOccurs = 0

For occurs in Array (status.values)

{

If occurs >maxoccurs

{

MaxOccurs = occure

}

for (ch,occurs) in status

{

If occurs = = MaxOccurs

{

println ("Occurrences of the most characters: \ (ch), occurrences: \ (occurs) times")

}

}

}

Swift Learning Note 5