func findMaxConsecutiveOnes(_ nums: [Int]) -> Int {

    var result = 0
    var current = 0

    var r = 0

    while r < nums.count {

        if nums[r] == 1 {
            current += 1
            result = max(current, result)
        } else if nums[r] == 0 {
            current = 0
        }

        r += 1
    }
    return result
}

let nums = [1,0,1,1,0,1]
findMaxConsecutiveOnes(nums)