swift是现代编程语言的综合体，灵活而强大。
//http://www.cocoachina.com/newbie/basic/2014/0604/8675.html
//语法var 变量，let 变量
var param1 = 5
var param2: Double = 6.0
let param3 = "5 + 6 = \(param1+param2)"
// 字典dict，key是String,value是Float的数组
var dict = Dictionary<String,Array<Float>>()
dict["football_score"] = [5.5,9.0,4]
dict["basketball_score"] = [99,101,87,73]
var largest: Float = 0.0
for (keys,values) in dict{
for score in values{
if largest< score{
largest = score
}
}
}
var firstForLoop = 0
// for in 中的 0..3，是 i=0;i<3。0...3，是 i=0;i<=3
for i in 0...3 {
firstForLoop += i
}
语法
//http://www.cocoachina.com/newbie/basic/2014/0607/8717.html
//func作为函数时，func可以当函数参数、函数返回值,func在某种角度上可以对象去理解
func function1(name: String[],fun: (String,Int)->String) -> (Int,Int)->Bool{
func afn(param: Int,param2: Int)->Bool{
return param>param2
}
//内联函数afn可以简写成下面。返回类型为函数时，该函数会保留上下文作用域内的，变量常量的值；返回的函数相当于一个对象，作用域内的值相当于对象的属性
return {(param: Int,param2: Int)-> Bool in return param>param2}
}