[swift-evolution] [Pitch] Add an all algorithm to Sequence

Richard Wei rxrwei at gmail.com
Sun Apr 2 04:17:55 CDT 2017

`withoutException` sounds confusing to me. And it’ll potentially make a Swift newcomer think it has something to do with runtime exceptions.

IMO `forAll(_:)` is the best name. It looks logically, quantificationally clear. With regard to the possible confusion w/ `forEach`, the “each" in `forEach` conveys the sense of iteration, while the “all” in `forAll` conveys both iteration and conjunction.


> On Apr 2, 2017, at 00:05, Robert Bennett via swift-evolution <swift-evolution at swift.org> wrote:
> It figures, the hardest thing to pick is the name of this function…
> I like forAll the best so far, but I worry that it sounds too much like forEach and would be confusing.
> What does everyone think of withoutException? nums.withoutException(isEven) and nums.withoutException { isEven($0) } make their purpose clear, and even make clear what happens for an empty Collection.
> Other options that come to mind that I am less enthusiastic about:
> nums.every(satisfies: isEven) / nums.every { isEven($0) }
> nums.entirely(isEven) / nums.entirely { isEven($0) }
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