[swift-evolution] Optional Argument Chaining

[Xiang Deng]

Hi all,

We probably don't need additional syntax to achieve this. I just wrote a library which allows you to `(pass?.aLongOptionalChaining()?.to ?< aFunctionTakingNonOptionalValues(:))?.ThenDoSomethingElse()` with `?>` operator.

The multiple parameters example:

(john.address, alice.address, 2.0) ?> getPostageEstimate(source:destination:weight:)

> // Equivalent to

> john.address.flatMap { freshVar1 in
> 	alice.address.flatMap { freshVar2 in
> 		getPostageEstimate(source: freshVar1, destination: freshVar2, weight: 2.0)
> 	}
> }


See more about the library: https://github.com/ddddxxx/ChainingFunction <https://github.com/ddddxxx/ChainingFunction>

--
Xander

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