数组

创建不可变数组

第一种方式：

let array = NSArray(array: ["First","Second","Third"])

第二种方式：

let array = ["First","Second","Third"]

创建可变数组

var array = ["First","Second","Third"]

将对象追加到数组

array.append("Forth")

辞典

创建不可变字典

let dictionary = ["Item 1": "description", "Item 2": "description"]

创建可变字典

var dictionary = ["Item 1": "description", "Item 2": "description"]

将新的配对添加到字典

dictionary["Item 3"] = "description"

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