score3

// wanted a version where i could just use reduce but without building a Frame object ...
// expands rolls to include bonus values, e.g. 
    
    func testExpandRolls() {
        let game = BowlingGame()
        game.roll(5,4, 10, 5,5, 6,5)
        var expanded = game.expandRolls()
        XCTAssertEqualObjects(expanded, [5,4, 10,5,5, 5,5,6, 6,5], "expanded")
    
    }
    
    // resulting in easy score()
    
    func score() -> Int {
        return expandRolls().reduce(0,{$0+$1})
    }
    
    // but expand isn't all that nice ...
    
    func expandRolls() -> Int[] {
        var result  = Int[]()
        var i = 0;
        while i < rolls.count {
            result += rolls[i]
            result += rolls[i+1]
            if ( rolls[i] == 10 ) {
                result += rolls[i+2]
                i++
            } else if rolls[i] + rolls[i+1] == 10 {
                result += rolls[i+2]
                i += 2
            } else {
                i += 2
            }
        }
        return result
    }

Hi Ed, thanks ...

Well, I haven't tested it here so I could believe it wouldn't work. Offhand, it looks to me as if it might subscript off the end of the array. Mostly what I wanted to know was whether I liked the expand rolls idea. So as soon as I saw what it had to do, I knew I wanted to go another way, and stopped working this thread.

I've not posted the one I went with, which uses a framing object instead. I'll do that if I get a chance.