最近在playground上得demo code

如题

let names = ["aleige","cdameng","bhouzi"]
var reversed = (names, { (firstString: String, secondString: String) -> Bool in
    return firstString > secondString
})

reversed = (names, >)


reversed = (names, { firstString, secondString in return firstString > secondString})

reversed = (names, { firstString, secondString in firstString > secondString})

reversed = (names, { $0 > $1 })

reversed = (names, >)



var odds = [Int]()
for i in 1...10 {
    if i % 2 == 1 {
        odds.append(i)
    }
}

print(odds)

odds = Array(1...10).filter { $0 % 2 == 1 }
print(odds)


func plusAandB(a:Int) (b:Int) -> Int {

    return a+b
}

let plusFive = plusAandB(5)
let plusTen = plusFive(b: 10)

let plus11 = plusFive(b: 11)

print(plus11)

//var
//let

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

func minMax(array: [Int]) -> (min:Int, max:Int) {
    
        var currentMin = array[0]
        var currentMax = array[0]
        
        for value in array[1..<array.count] {
                if value < currentMin {
                        currentMin = value
                }else
                    if
                        value > currentMax {
                            currentMax = value
                }
        }
    
        return(currentMin, currentMax)
}

print(minMax(array))
print(minMax(array).max)
print(minMax(array).min)




func averageNumbers(numbers:Double...) -> Double
{
    
    var total:Double = 0
    
    for number in numbers {
            total += number
    }
    
    return total / Double(numbers.count)
}

//inout
// _

func swapTwoInts(inout a: Int, inout b: Int) {
    let temporaryA = a
    a = b
    b = temporaryA
}

var someInt = 3
var anotherInt = 107

swapTwoInts(&someInt,b: &anotherInt)
print("someInt is now \(someInt), and anotherInt is now \(anotherInt)")

func chooseSayHelloFunction(lang: String) -> (String) -> String{
    
    func sayHelloInChinese(name: String) ->String{
        return "你好 "+name
    }
    
    func sayHelloInEnglish(name: String) -> String{
        return "hello "+name
        
    }
    return lang == "cn" ? sayHelloInChinese: sayHelloInEnglish
}

let sayHelloInChinese = chooseSayHelloFunction("cn")
print(sayHelloInChinese("d哆啦A梦"))


func swapTwoValues<T>(inout a: T, inout b: T) {
    let temporaryA = a
    a = b
    b = temporaryA
}

var aString = "a"
var bString = "b"

swapTwoValues(&aString,b: &bString)
print("aString is now \(aString), and bString is now \(bString)")


var aInt = 55
var bInt = 99

swapTwoValues(&aInt,b: &bInt)
print("aInt is now \(aInt), and bInt is now \(bInt)")

by peixl