数组的修改可以使用append方法或者+=
var 购物清单 = ["鸡蛋", "牛奶"]
购物清单.append("苹果")
购物清单 += "草莓"
println("(购物清单)") //[鸡蛋, 牛奶, 苹果, 草莓]
数组的获取，可以通过索引，也可以通过区间运算符
var 购物清单 = ["鸡蛋", "牛奶"]
println("(购物清单[0])") //鸡蛋
println("(购物清单[0..1])") //[鸡蛋]
println("(购物清单[0...1])") //[鸡蛋, 牛奶]
println("(购物清单[0...2])") //[鸡蛋, 牛奶, ]
dictionaries的定义
var airports: Dictionary<String, String> = ["TYO": "Tokyo", "DUB": "Dublin"]
//也可以简化为
//var airports = ["TYO": "Tokyo", "DUB": "Dublin"]
它的修改与读取使用[],而不能使用.
airports["BJ"] = "Beijin"
控制语句
如前面的几个例子所示，控制语句的条件不像js有小括号
for var index = 0; index < 3; index++ {
println("index is (index)")
}
//index is 0
//index is 1
//index is 2
函数
函数的声明与调用：
func sayHello(personName: String) -> String {
let greeting = "Hello, " + personName + "!"
return greeting
}
println(sayHello("jserme"))
无返回的函数，其实质是返回一个Void，它等同于一个空的元组()
多返回值的函数与默认参数：
func info(word:String = "aha") -> (length:Int, containA:Bool){
var containA = false
for char in word {
if( char == "a") {
containA = true
break
}
}
return (word.utf16count, containA)
}
println(info(word: "波波")) //(2, false)
println(info()) //(3, true)
便于阅读的外部参数名，在参数定义之前，与参数定义以空格隔开，如下面的多个参数
func join(string s1: String, toString s2: String, withJoiner joiner: String)
-> String {
return s1 + joiner + s2
}
//调用的时候
join(string: "hello", toString: "world", withJoiner: ", ")
// returns "hello, world"
