dictionary字典

//: Playground - noun: a place where people can play

import UIKit

var str = "字典"

//声明一个字典

var dic: Dictionary<String,String> = ["1001":"1","1002":"2","1003":"3"]

var num = dic["1001"]

//向字典中添加键值

var student: Dictionary<Int,String> = [1001:"小明",1002:"小六",1003:"小杰"]

student[1004] = "小鹏"

student

//修改

student.updateValue("小威", forKey: 1001)

student

//删除

student.removeValueForKey(1001)

student

//获得值

let value = student[1002]

//遍历

for (key, value) in student {

    println("key:\(key),value:\(value)")

}

for tuples in student {

    println("key:\(tuples.0),value:\(tuples.1)")

}

//遍历key

for key in student.keys {

    println("key:\(key)")

}

//遍历value

for value in student.values {

    println("value:\(value)")

}

switch 1 {

case 1:

    println("123")

    fallthrough

case 2:

    println("456")

case 3:

    println("789")

default:

    println("3")

}