“|” often means “with” in math, which is only one word off from “with step”.
func | <T: Strideable where T.Stride : IntegerType> (range: Range<T>, stride:
T.Stride) -> IntegerStrideTo<T> {
return IntegerStrideTo(_start: range.startIndex, end: range.endIndex,
stride: stride)
}
var arr = [Int]()
for i in (0 ..< 10) | 2 {
arr.append(i)
}
arr //[0,2,4,6,8]
I couldn’t figure out how to do it without the parens… everything I could think
to try is determined to parse as `(0) ..< (10 | 2)`, so `arr` ends up equalling
[0,1,2,3,4,5,6,7,8,9]. If operator precedence and associativity were
per-function rather than per-op, it could be made to work without the ().
- Dave Sweeris
> On Apr 14, 2016, at 8:27 PM, Brent Royal-Gordon via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> That means we would need an expression along the lines of:
>
> 1..<10 by 2
>
> Which could be used anywhere. Unfortunately, Swift does not allow word
> characters in identifiers, so `by` as an operator is a non-starter. I can't
> think of a non-letter operator for `by` that would make sense, so we're
> probably not going to go that route, either (but if you have a
> suggestion—preferably one backed by existing notation from, say, math—by all
> means suggest it).
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