I'm in favour of getting rid of enumerated; I think like many people I used it
expecting to get actual indices, and it's very easy to think this when working
with arrays (as the values will in fact be perfectly valid). In reality the
right way to do it is with one of the following:
for eachIndex in myArray.indices { print("\(eachIndex): " + myArray[eachIndex])
}
for eachIndex in myArray.startIndex ..< myArray.endIndex { print("\(eachIndex):
" + myArray[eachIndex]) }
var offset = 0; for eachEntry in myArray { print("\(offset): \(eachEntry)");
offset += 1 }
However, I think I'd still support the inclusion of an enumerating and an
indexing type that sequences/collections can be wrapped in to perform
enumeration/indexing if you still want it.
> On 31 Jan 2017, at 14:24, Chris Eidhof via swift-evolution
> <[email protected]> wrote:
>
> Hey everyone,
>
> I've organized a number of Swift workshops over the last two years. There are
> a couple of things that keep coming up, and a couple of mistakes that I see
> people making over and over again. One of them is that in almost every
> workshop, there's someone who thinks that `enumerated()` returns a list of
> (index, element) pairs. This is only true for arrays. It breaks when using
> array slices, or any other kind of collection. In our workshops, I sometimes
> see people doing something like `x.reversed().enumerated()`, where `x` is an
> array, and somehow it produces behavior they don't understand.
>
> A few ways I think this could be improved:
>
> - Move enumerated to Array
> - Change enumerated to return `(Index, Iterator.Element)` (this would mean we
> at least need to move it to collection)
> - Remove enumerated
> - Keep things as is
>
> In any case, just wanted to share my experience (gained from teaching
> people).
>
> --
> Chris Eidhof
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> swift-evolution mailing list
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