In the given code snippet, we have used var to declare viewOne and let

1.	In the given code snippet, we have used var to declare viewOne and let to create viewTwo. Will the last line compile?
Answer» import UIKitvar viewOne = UIView()viewOne.alpha = 0.7let viewTwo = UIView()viewTwo.alpha = 0.7 // Does this line COMPILE? The last line will, in fact, compile. viewOne is a variable that we can reassign to a new UIView object. Because we can only assign a value once with let, the FOLLOWING code will not compile: viewTwo = viewOne // Error: viewTwo is immutable However, because UIView is a reference-based CLASS, we can change the properties of viewTwo — which means the following code will compile: let viewTwo = UIView()viewTwo.alpha = 0.7 // Yes, this COMPILES!

In the given code snippet, we have used var to declare viewOne and let to create viewTwo. Will the last line compile?

Answer»

import UIKitvar viewOne = UIView()viewOne.alpha = 0.7let viewTwo = UIView()viewTwo.alpha = 0.7 // Does this line COMPILE?

The last line will, in fact, compile. viewOne is a variable that we can reassign to a new UIView object. Because we can only assign a value once with let, the FOLLOWING code will not compile:

viewTwo = viewOne // Error: viewTwo is immutable

However, because UIView is a reference-based CLASS, we can change the properties of viewTwo — which means the following code will compile:

let viewTwo = UIView()viewTwo.alpha = 0.7 // Yes, this COMPILES!

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