Existential Operator / Null Propagation Operator

[Kevin Smith]

> In TypeScript `?` means optional. But throw if the value is nil is the
> same same as non-nullable?
>

In Swift, the postfix "!" operator unwraps an optional value, throwing if
nil.

See
https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/OptionalChaining.html
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