数组字典的常见操作

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	数组	字典
增	shoppingList.append("Flour") shoppingList += ["Baking Powder"] shoppingList += ["Chocolate Spread", "Cheese", "Butter"]
删	let mapleSyrup = shoppingList.remove(at: 0) let apples = shoppingList.removeLast()
改	var firstItem = shoppingList[0] shoppingList[0] = "Six eggs" shoppingList[4...6] = ["Bananas", "Apples"] shoppingList.insert("Maple Syrup", at: 0)
查	sixDoubles.count shoppingList.isEmpty //遍历 //for-in, enumerated() for item in shoppingList { print(item) } //需要索引，用 enumerated() for (index, value) in shoppingList.enumerated() { print("Item (String(index + 1)): (value)") }