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| Language | Swift |
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| Owner | w3xue |
| Created | 3 years ago |
| Modified | 3 years ago |
| Visibility | Public |
struct Animal {
let species: String
init?(species: String) {
if species.isEmpty { return nil }
self.species = species
}
}
//通过该可失败构造器来构建一个Animal的对象，并检查其构建过程是否成功
// someCreature 的类型是 Animal? 而不是 Animal
let someCreature = Animal(species: "长颈鹿")
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