我的swift 学习过程

import Foundationprint("Hello, World!")let emptyArray1 = []let empryArray2 = []var shoppingList = ["1","2","3","4","5"]print(shoppingList.count)print(shoppingList[1])shoppingList[1] = "bottle of water"print(shoppingList[1])let emptyDic = [:]let emptyDic1 = Dictionary()

var occupations = [

"My":"I",

"U":"you"

]

print(occupations["My"])

occupations["LL"] = "KKK"

print("the occupation count is" + String (occupations.count) )

var shoppIng = ["小米","大米","玉米","糯米"]

shoppIng.append("红米")

print(shoppIng)

shoppIng.insert("英语", atIndex: 2)

print(shoppIng)

shoppIng += ["白菜","西瓜"]

//shoppIng += "白菜"

print(shoppIng)

print(shoppIng.isEmpty)

print(shoppIng.count)

print(shoppIng.capacity)