Hi. I wonder why printed implicitly unwrapped optional is still surrounded by the parentheses and Optional? If its implicitly unwrapped, why does it not prints just the number? Many thanks.
IOUs are only syntax sugar. They allow you to avoid writing ! every time you reference a property or pass it as a non-optional parameter, but it has no effect on the type. At runtime, the system has no idea it was defined using the IOU syntax.
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thank You:)
Also in some cases the compiler will still interpret it as an Optional and needs to be dealt with.
If I recall correctly, I've usually seen this in cases where you're passing an IUO to some pure-Swift function or initializer that is expecting a non-optional value.