[swift-users] array.first vs. array[0]

[David Turnbull]

On Sat, Jan 16, 2016 at 2:46 PM, Adriano Ferreira via swift-users <
swift-users at swift.org> wrote:

> Isn’t the subscript supposed to return an optional as well?
>

Not arrays. They stop your program when out of bounds.


> Why unwrapping isn't required when `pivot` is used within the `filter`
> call?
>

Type inference on the closure. $0 is made optional as part of the call.

-david
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