Swift 新手指南

本文講的是swift 新手指南，

表達他們對這一過時語言的困擾。

var greeting: string = "hello world"

var greeting = "hello world" // 推斷為字串型別

var greeting = "hello world" // 推斷為字串型別

greeting = "hello swift"

let greeting = "hello world"

greeting = "hello swift" //編輯器錯誤

let languagename: string = "swift"

var version: double = 1.0
let introduced: int = 2014
let isawesome: bool = true

let languagename = "swift" // 推斷為字串型別

var version = 1.0 // 推斷為 double 型
let introduced = 2014 // 推斷為 int 型
let isawesome = true // 推斷為 bool 型

let title = "an absolute beginners guide to swift"

let review = "is awesome!"
let description = title + " - " + review
// description = "an absolute beginners guide to swift - is awesome!"

let datepublished = "june 9th, 2014"

let postmeta = "blog post published on: \(datepublished)"
// postmeta = "blog post published on: june 9th, 2014"

var version = 1.0 // 推斷為 double 型

var version: float = 1.0

var cardnames: [string] = ["jack", "queen", "king"]

// swift 可以推斷出 cardnames 是 [string] 型別，所以可以寫成：
var cardnames = ["jack", "queen", "king"] // inferred as [string]

println(cardnames[0])

var todo = ["write blog","return call"]

todo += "get grocery"

todo += ["send email", "pickup laundry"]

todo[0] = "proofread blog post"

todo[2..<5] =="" ["pickup="" laundry","get="" grocery",="" "cook="" dinner"]="" <="" code="">

var cards = ["jack" : 11, "queen" : 12, "king" : 13]

cards["ace"] = 15

cards["ace"] = 1

println(cards["ace"])

while !complete

var message = "starting to download"

do  while !complete

for var i = 1; i < cardnames.count; ++i

for cardname in cardnames

for number in 1...10

for (cardname, cardvalue) in cards

if cardvalue == 11  else if cardvalue == 12  else

switch表示式必須對應每乙個可能值，否則得使用default case讓**更安全。如果沒有為每乙個可能值都提供case也沒有使用default那麼會報編譯錯誤：「switch 必須是完備的」。

switch cardvalue

switch distance

switch distance

func printcard()

func printcard(cardname: string)

func printcard(cardname: string, cardvalue: int)

func buildcard(cardname: string, cardvalue: int) -> string

原文發布時間為：2023年01月07日

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