Swift : what is the right way to split up a [String] resulting in a [[String]] with a given example?

Question

Starting with a large [String] and a given subarray size, what is the best way I could go about splitting up this array into smaller arrays? (The last array will be smaller than

Answer 1

You can map over the indices into you array:

extension Array {
    func chunked(size: Int) -> [[Element]] {
        let cnt = self.count
        return stride(from: 0, to: cnt, by: size).map {
            let end = Swift.min($0 + size, cnt)
            return Array(self[$0.. [["1", "2", "3", "4"], ["5", "6", "7", "8"], ["9"]]

["1","2","3","4","5","6","7","8","9"].chunked(size: 3)
// -> [["1", "2", "3"], ["4", "5", "6"], ["7", "8", "9"]]