Users who don’t get the single-pass nature of SequenceType may expect a .last as well.
> On Dec 30, 2015, at 3:57 PM, Kevin Ballard via swift-evolution > <[email protected]> wrote: > > It's sometimes useful to get the first element of a sequence. To that end I'd > like to propose > > extension SequenceType { > /// Returns the first element of `self`, or `nil` if `self` is empty. > /// - Complexity: O(1) > var first: Self.Generator.Element? { > var gen = generate() > return gen.next() > } > } > > I think it makes sense to add this property to the definition of SequenceType > as well, so various sequences can override it to avoid constructing a > generator. > > With this added to SequenceType, we can remove it from CollectionType, as the > behavior will be the same. > > -Kevin Ballard > > _______________________________________________ > swift-evolution mailing list > [email protected] > https://lists.swift.org/mailman/listinfo/swift-evolution
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