In Swift,there's no way to get the returned function's argument names?

Question

When a function\'s return value is another function,there\'s no way to get the returned function\'s argument names.Is this a pitfall of swift language?

For example:<

Answer 1

You're correct. From the Swift 3 release notes:

Argument labels have been removed from Swift function types... Unapplied references to functions or initializers no longer carry argument labels.

Thus, the type of townPlan, i.e. the type returned from calling makeTownGrand, is (Int,Int) -> Int — and carries no external argument label information.

For a full discussion of the rationale, see https://github.com/apple/swift-evolution/blob/545e7bea606f87a7ff4decf656954b0219e037d3/proposals/0111-remove-arg-label-type-significance.md