guard let name = name else { return }
name 不爲nil就賦值,否則就返回
func showName(name: String?) {
guard let name = name else {
print("name==nil")
return
}
print("my name is \(name)")
}
showName(name: nil)
showName(name: "jack")
喜歡可以加Q羣號:874826112,一起學習,成長,交流工作經驗,
記得要點贊,評論哦😯;
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