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Language	Swift
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class Person {
    var residence: Residence?
}
 
class Residence {
    var numberOfRooms = 1
}
 
let john = Person()
 
// 链接可选residence?属性，如果residence存在则取回numberOfRooms的值
 
 
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Snippet Metadata
Owner	w3xue
Created	3 years ago
Modified	3 years ago
Visibility	Public