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iOS Object-Oriented Swift Value vs Reference Types Final Exam - Solution

James Pacheco
James Pacheco
1,810 Points
Posted by James Pacheco
James Pacheco
1,810 Points

Why "newValue" instead of "area?"

On line 30 of his Xcode window, why does he use "newValue" as a replacement variable in the setter method instead of using "area?"

1 Answer

Chon Long Chiang
Chon Long Chiang
9,132 Points
Chon Long Chiang
Chon Long Chiang
9,132 Points

The setter method will be called when the property, area, is being assigned a new value. When that happens, we want the code to change the sideLength (and automatically change the area as well since its a computed property) So we write: sideLength = sqrt(newValue) All it means is when we assign a new value to a square object, say mySquare, like this: mySquare.area = 100, the 100 here will be accepted as the newValue, and the sideLength would be set to sqrt(100) = 10. If you need a refresh, watch the video in this course under "Properties" : "Setter and Getter Methods".