Erica Sadun

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Swift: Figuring out anyGenerator

Here you go

var n = 0
var naturalNumbers = anyGenerator{return n++}
naturalNumbers.next()
naturalNumbers.next()
naturalNumbers.next()
naturalNumbers.next()

// and

enum Dwarf: Int {
    case Bashful = 1, Doc, Dopey, Grumpy, Happy, Sleepy, Sneezy
    static var members : [Dwarf] { var i = 1
        return Array(anyGenerator{return Dwarf(rawValue: i++)})
    }
}
print(Dwarf.members)
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4 Comments

  • Any idea why this has been made into a class in Swift 2?

    • I think it was because of the immutable state that is implied by a struct – since anyGenerator is so stateful it seems more class-ish. The reason that the standard library generators aren’t classes, then, is because of speed requirements, as far as I know.

  • I think you can even drop the “return” statement.

    • By mdeh

    • as in “var naturalNumbers = anyGenerator{n++}
      “

      • By mdeh