Swift字典

        // 1.定义一个不可变数组
        let dic = ["name": "张三","age": 18] as [String : Any]
        print(dic)
        
        // 2.定义一个可变空数组
        var dic1 = [String: Any]()
        
        // 3.添加元素
        dic1["name"] = "王五"
        dic1["age"] = 18
        print(dic)
        
        // 4.获取元素
        let name = dic1["name"]
        if let s = name {
            print(s)
        }
        
        // 5.移除元素
//        dic1.removeValue(forKey: "age")
        dic1["name"] = nil
        print(dic1)
        
        // 6.遍历字典 
        for (key,value) in dic1 {
            print("key:\(key)->value:\(value)")
        }
    
        // 遍历所有key
        for k in dic1.keys {
            print(k)
        }
        
        // 遍历所有value
        for v in dic1.values {
            print(v)
        }
        
        // 7.字典合并
        var dictionary = ["name": "王五", "age": 18] as [String : Any]
        let dictionary2 = ["on": 14] as [String : Any]
        
        for (k,v) in dictionary2 {
            dictionary[k] = v
        }
        print(dictionary)