Swift3.0 - Array

list1 = ["你好","2","3","4"]
let list2:[String] = ["你好","2","3","4"]
let list3:[Any] = ["你好","2","3",3,UILabel()]
let list4:NSArray =  ["你好","2","3","4",UILabel()]
let list5:NSMutableArray =  ["1","2","3","4"]

list2.removeAll() //  如果定义为var
list2 = [] // 如果定义为var
list5.removeAllObjects() // var 和let 都可以
list5 = [] // 如果定义为var

shoppingList[4...6] = ["Bananas", "Apples"] // 将数组4...6 的范围用指定的数组取代

 shoppingList.insert("Maple Syrup", at: 0)
 let mapleSyrup = shoppingList.remove(at: 0)
 let apples = shoppingList.removeLast()

 for item in shoppingList {
  print(item)
 }
 for (index, value) in shoppingList.enumerated() {
    print("Item \\(index + 1): \\(value)")
 }

func map<T>(_ transform: (Element) throws -> T) rethrows -> [T]

//1.先定义一个数组
var numbers = [21, 19, 7, 12]
//2.创建一个有一个参数一个返回值的闭包函数
var closure = {(number:Int) -> Int in
var  result = number
if number > 20 {
result *= 3
}
return result
}
//3.调用map函数
print(numbers.map(closure))

let mappedNumbers = numbers.map({ number -> Int in
    if number > 20{
      return 3 * number
    }
      return number
})

let mappedNumbers = numbers.map({ number -> Int in
  return number*3
})

let mappedNumbers = numbers.map({ number  in
   number*3
})

 let mappedNumbers = numbers.map({_ in 
   return 0
})

var numbers = Array(repeating: 3, count: 1000000)
var date1 = NSDate()
for i in 0..<numbers.count{
  numbers[i] = 0
}
print(NSDate().timeIntervalSince(date1 as Date))

var numbers = Array(repeating: 3, count: 1000000)
var date1 = NSDate()
var newNumbers = numbers.map({_ in
    return 0
})
print(NSDate().timeIntervalSince(date1 as Date))

public func sorted(by areInIncreasingOrder: (Element, Element) -> Bool) -> [Element]

ar date1 = NSDate()
numbers.sort(by: {$0 > $1})
var swap:Int
for i in 0..<numbers.count{
    var num = numbers[i]
    for j in i..<numbers.count{
       if num < numbers[j]{
           (num,numbers[j]) = (numbers[j],num)
      }
  }
}

var numbers = Array(repeating: 3, count: 1000000)
for i in 0..<numbers.count{
    numbers[i] = i
}
var date1 = NSDate()
numbers.sort(by: {$0 > $1})
print(NSDate().timeIntervalSince(date1 as Date))