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errorMsg?.upperCaseString 嘗試解包 errorMsg!.upperCaseString 確定解包（確保不為空，否則報(bào)錯(cuò)）查看全部
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閉包簡(jiǎn)化查看全部
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初始化查看全部
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多次解包語法簡(jiǎn)寫。查看全部
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測(cè)試<br> var errorMessage: String? = "Not found"<br> let message3 = errorMessage?? "No error":errorMessage查看全部
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arr.sort({(a: Int, b: Int) -> Bool in return a > b }) arr.sort({(a:Int, b:Int) -> Bool in return a > b}) arr.sort({a, b in return a > b}) arr.sort({a, b in a > b}) arr.sort({$0 > $1}) arr.sort(>)查看全部
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func tier1MailFeeBy(weight:Int) -> Int { return 1 * weight } func tier2MailFeeBy(weight:Int) -> Int { return 3 * weight } func feeBy(unitPrice: Int, weight: Int) -> Int { func chooseMailFeeCalculationBy(weight: Int) -> (Int) -> Int { return weight <= 10 ? tier1MailFeeBy : tier2MailFeeBy } let maiFeeByWeight = chooseMailFeeCalculationBy(weight) return maiFeeByWeight(weight) + unitPrice * weight } var price = 20 var weight = 15 feeBy(price, weight: weight)查看全部
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？？ 判斷是不是nil ps message ？？ “hi”查看全部
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func getBinaryBy(num: Int) -> String { var res = "" var num = num repeat { res = String(num % 2) + res num /= 2 } while num != 0 return res } getBinaryBy(20) func swapTwoNum(inout num1: Double, inout _ num2: Double) { (num1, num2) = (num2, num1) } var a: Double = 34 var b: Double = 65 swapTwoNum(&a, &b) a b查看全部
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極簡(jiǎn)模式，太強(qiáng)大了查看全部
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func sayHelloTo(name: String, withGreetingString greeting: String = "hello") -> String { return "\(greeting), \(name)" } sayHelloTo("Zhang Qian") func minus(num1: Int, _ num2: Int) -> Int { return num1 - num2 } minus(5, 8) func sayHiTo(names: String ..., withGreetingWords greeting: String) { for name in names { print("\(greeting), \(name)") } } sayHiTo("Steve","Bill","Dell", withGreetingWords: "Good Afternoon")查看全部
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函數(shù)的調(diào)用以類似于回調(diào)的方式來實(shí)現(xiàn)查看全部
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選擇合適的數(shù)據(jù)結(jié)構(gòu)查看全部
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臥槽這精簡(jiǎn)查看全部
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函數(shù)作為返回值的寫法查看全部
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