在swift3中如何高效地将一维数组转换为二维数组

func convertTo2DArray<T>(array: [T], columns: Int) -> [[T]] {
    let rows = (array.count + columns - 1) / columns
    var result = [[T]](repeating: [T](), count: rows)
    
    for (index, element) in array.enumerated() {
        let row = index / columns
        result[row].append(element)
    }
    
    return result
}