Method parameter shadowing

[Boon]

Swift allows you to shadow method parameter without providing any warning. 

In what circumstances would such a feature be useful? Also, this seems to go against the premise of Swift to promote safety.

var x:Int? = 3

func foo(x: Int?) {
    print(x)
    let x = 100  // shadowing parameter
    print(x)
}

[Jim Dovey]

I believe it’s by design, to ease working with Optionals. For instance, in v2 syntax, you can have the following to ‘promote’ an optional argument into a non-nil value:

func foo(x: Int?) -> Int? {

    guard let x = x else { return nil }

    return x + 10

}

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[Boon]

That helps, thank you Jim.