1.其他类型转化为字符串
let label ="The width is"
let width =94
let widthLabel = label +String(width)
String(width) -> [NSString stringWithFormat:@"%@", width]
2.控制流
letvegetable ="red pepper"
switch vegetable {
case"celery":
print("Add some raisins and make ants on a log.")
case"cucumber","watercress":
print("That would make a good tea sandwich.")
case le tx where x.hasSuffix("pepper"):
print("Is it a spicy \(x)?")
default:
print("Everything tastes good in soup.")}
switch支持任意类型的数据以及各种比较操作——不仅仅是整数以及测试相等。
不用break?
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