分享playground

import UIKit
import Foundation

var va1 = "test...."
let va2 = "test...fsd"
//va1 = "fsdfesfd"
//va2 = "fsesdf"

//申明字典
var dic1 = [String: NSObject]()

var tuple1: (Int, String) = (404, "page not found")
var tuple2 = (first: 3, second: 3, result: "night")
tuple1.0
tuple2.first

//类，结构体，枚举
class SomeClass {
    // class definition goes here
    var width: Int = 0
    var height: Int = 0
    class func hello2(){
        print("someClass")
    }
}

SomeClass.hello2()
//var someClass = SomeClass()
struct SomeStructure {
    // structure definition goes here
    var width: Int
    var height: Int
    func hell0(){
        print("hello word!")
    }
    static func hello2(){
        print("what is this")
    }
}

//var someStruct = SomeStructure(width: <#T##Int#>, height: <#T##Int#>)

enum CompassPoint: Int {
    case North
    case South
    case East
    case West
}
var east: CompassPoint = .East
east.rawValue

enum Result<Value> {
    case Success(Value)
    case Failure(ErrorType)
}

func getDataFromNet() {

//    (value: T?, error: ErrorType?) -> Void
//    if let error = error {
//        // handle error
//    } else if let value = value {
//        // handle value
//    } else {
//        // all nil?
//    }

    // balaba  <get   data asnyn from net
    let result: Result = Result.Success("some data get from net")
    switch result {
    case .Success(let value):
        print(value)
    case .Failure(let err):
        print(err)
    }
}

//optional

var someValue: Int = 4
var someValue2: Int? = 5
var someValue3: Optional<Int> = 6
var someValue4: Int?? = 7
print(someValue)
print(someValue2)
print(someValue3)
print(someValue4)
print(someValue3!)
print(someValue + someValue4!!)

var someArray: [Int]?
someArray = [1, 2, 3]
someArray.map({ "No.\($0)"})

//控制语句
let flag = true

if flag {
    print("hello swift!")
} else {
    print("don't borther me!")
}

switch tuple2 {
case (_, _, let result):
    print(result)
case (1, 2, let result):
    print("haha")
}

var i = 10
repeat {
    i++
    print("hello swift")
} while(i < 100)

while i < 120{
    print(11)
    i++
}

//函数，闭包

func sum(a:Int,b:Int)->Int{
    return a + b
}
sum(2, b: 3)

//curried func
func sum(a:Int)->Int->Int{
    return { b in
        return a + b
    }
}
var addThree = sum(3)
addThree(2)
sum(3)(3)

//协议扩展
extension Int {
    func cube() -> Int {
        return self * self * self
    }
}
2.cube()

extension UIView {
    func removeAllSubview() -> Void {
        for view in self.subviews {
            view.removeFromSuperview()
        }
    }
}

let uiview = UIView.init()
uiview.removeAllSubview()

//guard 特性

func readCampusConfig() {

//    金字塔
//    if let value = NSUserDefaults.init(suiteName: "campus") {
//        if let uin = value.stringForKey("uin") {
//            print(uin)
////            .....
//        }
//    }

    guard let value = NSUserDefaults.init(suiteName: "campus") else {

        return
    }
    guard let uin = value.stringForKey("uin") else {
        return
    }
    print(uin)
//    .....
}

//闭包

var names = [4, 3, 5, 7, 1, 12, 8]
var name2 = names.flatMap { (int) -> String? in
    return "\(int)"
}
//name2

names.sort({ (a: Int, b: Int) -> Bool in
    return a < b
})
names.sort({ a, b in
    return a < b
})
names.sort({
    $0 < $1
})
names.sort( <)
names.sort( >)

// 函数式编程

var someVar:Int? = 3

someVar.map { some -> Int in
    return some + 2
}