[swift-evolution] ed/ing, InPlace, Set/SetAlgebra naming resolution

[Stephen Canon]

> On Feb 11, 2016, at 6:24 PM, Brent Royal-Gordon via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 	exclusiveOrInPlace -> differ

While there’s a straightforward line of reasoning that led to this point, anyone who doesn’t know the history will be completely baffled when they come across:

	x.differ(y)

in source.  Even knowing the history, it’s awkward.

This really needs to be either “xor” or “symmetricDifference” to be understandable.  “symmetricDifferenceInPlace” gets to be a bit ridiculous, so I’d prefer “xor[InPlace]”.  “xor” is sufficiently widely-used to qualify as a term-of-art; it’s the easiest-to-read unambiguous name for this operation.

– Steve
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