aaronvegh

let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]

extension Array {
    func splitBy(subSize: Int) -> [[Element]] {
        return stride(from: 0, to: self.count, by: subSize).map { startIndex in
            if let endIndex = self.index(startIndex, offsetBy: subSize, limitedBy: self.count) {
                return Array(self[startIndex ..< endIndex])
            }
            return Array()
        }