Swift Rough Syntax

Document HTTPS://ITUNES.APPLE.COM/US/BOOK/THE-SWIFT-PROGRAMMING-LANGUAGE/ID881256329?MT=11 Http://download.csdn.net/de Tail/surfsky/7440835helloworld println ("Hello, World")----------------------------------------------------------  ---base-------------------------------------------------------------comment///**/semicolon line without a semicolon multiple statements on one line, plus a semicolon variable var MyVariable = 42 constant Let Myconstant = Explicitdouble:double =----------------------------------------------          ---------------data type-------------------------------------------------------------numeric type type Int:int32, Int64 Uint:uint32, Uint64 Double Float Various representations method let Decimalinteger = Binaryinteger = 0  b10001//In binary notation let Octalinteger = 0o21//+ octal notation let Hexadecimalinteger = 0x11// Hexadecimal notation Let decimaldouble = 12.1875 let exponentdouble = 1.21875e1 let Hexadecimaldoubl E = 0xc.3p0 Let PaddeddoubLe = 000123.456 Let onemillion = 1_000_000 bool (boolean) Let Orangesareorange = true let turnipsaredelicious = Fal Se vector Let (statusCode, statusmessage) = (404, ' not Found ') let (x, y) = (1, 2) Let Http200status = (statuscode:20 0, Description: "OK") println ("The Status code is \ (Http200status.statuscode)") string Let label = "the width is" le T width = 94 Let Widthlabel = Label + string (width) string added let apples = 3 let oranges = 5 Let AP        Plesummary = "I have \ (apples) apples." Let fruitsummary = "I had \ (apples + oranges) pieces of fruit." Array var shoppinglist = ["Catfish", "water", "tulips", "Blue paint"] shoppinglist[1] = "bottle of water" var Occupa tions = ["Malcolm": "Captain", "Kaylee": "Mechanic",] occupations["Jayne"] = "public Relations" let Emptyarray = Str Ing[] () shoppinglist = [] dictionary let emptydictionary = dictionary<string, float> () emptydictionary = [:] Null (NIL) and available is an empty object var serverresponsecode:int? = 404 Serverresponsecode = Nil----------------------------------------------let possiblestring:string?    = "An optional string."    println (possiblestring!) Let assumedstring:string!    = "An implicitly unwrapped optional string." println (assumedstring)------------------------------------------------------------- Data stream-------------------------------------------------------------if if i = = 1 {//This example'll compile SUCC essfully}switch Let vegetable = ' red pepper ' switch vegetable {case ' celery ': let Vegetab        Lecomment = "Add some raisins and make ants on a log."        Case ' cucumber ', ' watercress ': let vegetablecomment = ' would make a good tea sandwich. '        Case Let X where X.hassuffix ("Pepper"): let Vegetablecomment = "is it a spicy \ (x)?"    Default:let vegetablecomment = "Everything tastes good in soup." }for var firstforloop = 0 for var i = 0; I < 3; ++i {firstforloop + = 1} for I in 0..3 {firstforloop + = I}for (traversal array) Let Individualscores = [75 , 103, Teamscore = 0 for score in Individualscores {if score > {Teamscore + = 3} else {teamscore + = 1}} for (traversal dictionary) Let interestingnumbers = ["Prime": [2    , 3, 5, 7, one, all], "Fibonacci": [1, 1, 2, 3, 5, 8], "Square": [1, 4, 9, +,],] var largest = 0                For (kind, numbers) in Interestingnumbers {for number in numbers {if number > largest {    largest = number}}}while var n = 2 while n < {n = n * 2}do...while var m = 2 does {m = m * 2} while M < 100 assertion (assert) let Age =-3 assert (age >= 0, "A per Son's age cannot is less than zero ")------------------------------------------------------------- function-------------------------------------------------------------function definition and call func greet (name:string, day:string), String {return ' Hello \ (name), today is \    (day). "}    Greet ("Bob", "Tuesday") returns multiple data func getgasprices (), (double, double, double) {return (3.59, 3.69, 3.79)            } getgasprices () unlimited number parameter func sumof (Numbers:int ...), Int {var sum = 0 for numbers in numbers { Sum + = number} return sum} sumof () Sumof (42, 597, 12) nested function func returnfifteen ()-I NT {var y = ten func Add () {y + = 5} add () Return y} returnfifteen ()  return function variable func makeincrementer ()--(int-int) {func AddOne (number:int), int {return 1 + Number} return AddOne} var increment = Makeincrementer () increment (7) function as input parameter (similar to lambda expression) Fu NC hasanymatches (list:int[], condition:int, BOOL), BOOL {for item in list {if condition (it   EM) {             Return True}} return False} func Lessthanten (number:int), Bool {        Return number < {var numbers = [7], hasanymatches (numbers, Lessthanten) closure Numbers.map ({ (Number:int), Int in Let result = 3 * number return result}) the name is substituted with the names sort ([1, 5, 3, 12, 2] ) {$ > $-------------------------------------------------------------}        Object and class-------------------------------------------------------------class definition class Shape {var numberofsides:int = 0 var name:string init (name:string) {self.name = name} func simpledescription ()-&G T        String {return "A shape with \ (numberofsides) sides."    }} using var shape = shape () shape.numberofsides = 7 var shapedescription = shape.simpledescription () self/super Self---this super---parent Inherits Class Square:namedshape {var sidelength:double iNIT (sidelength:double, name:string) {self.sidelength = Sidelength super.init (name:name)        Numberofsides = 4} func area (), Double {return sidelength * sidelength}        Override Func Simpledescription (), String {return "A square with sides of length \ (sidelength)." }} Let Test = Square (sidelength:5.2, Name: "My Test Square") Test.area () test.simpledescription () property Var p  erimeter:double {get {return 3.0 * Sidelength} set {sidelength = newvalue/3.0}} method overload override Func    Simpledescription (), String {return "an equilateral triagle with sides of length \ (sidelength)." }willset and Didset (property value set before and after processing) var Triangle:equilateraltriangle {willset {square.sidelength = Newvalu E.sidelength}} can call let Optionalsquare:square for an empty object method? = Square (sidelength:2.5, name: "Optional square") Let Sidelength = Optionalsquare?. SIdelength generics 

struct Pair<t:equatable> {let    a:t!    Let b:t!    Init (A:t, b:t) {        SELF.A = a        self.b = b    }    func equal () Bool {        return a = = b    }}let pair = Pa IR (a:5, b:10) PAIR.A//5PAIR.B//10pair.equal ()//false Let Floatpair = Pair (a:3.14159, b:2.0) FLOATPAIR.A//3.14159 FLOATPAIR.B//2.0floatpair.equal ()//False

-------------------------------------------------------------enumerations and struct-bodies------------------------------------------------------        -------enum enum Rank:int {case aces = 1 case, three, four, Five, Six, Seven, Eight, Nine, Ten Case Jack, Queen, King func-simpledescription (), String {switch self {case. Ace:return "Ace" case. Jack:return "Jack" case. Queen:return "Queen" case.                                          King:return "King" Default: Return String (Self.toraw ())}}} Let Aces = Rank.ace let Acerawva Lue = Ace.toraw () if Let Convertedrank = Rank.fromraw (3) {Let threedescription = Convertedrank.simpleDescription ()} looks a little dizzy. Enum Serverresponse {case Result (string, string) case Error (string)} Let        Success = Serverresponse.result ("6:00pm", "8:09 pm") Let failure = Serverresponse.error ("Out of cheese.") Switch success {case let.        Result (Sunrise, Sunset): Let Serverresponse = "Sunrise are at \ (Sunrise) and sunset are at \ (sunset)." Case Let. Error (Error):} struct struct Card {var rank:rank var suit:suit func simpledescription () S Tring {return "the \ (Rank.simpledescription ()) of \ (Suit.simpledescription ())"}} let Threeofspa Des = Card (rank:. Three, suit:. Spades) Let threeofspadesdescription = Threeofspades.simpledescription ()

Swift Rough Syntax