Chunk an array into arrays of some size (or smaller)

Array+chunk.swift

extension Array {
  /// Chunk an array in to an array of arrays of the provided size (or smaller)
  /// - Parameters:
  ///   - size: the size of the chunk
  /// - Returns: An array of arrays of `Element`
  func chunked(into size: Int) -> [[Element]] {
    return Swift.stride(from: 0, to: self.count, by: size).map {
      Array(self[$0 ..< Swift.min($0 + size, self.count)])
    }
  }
}

use Apple's swift-algorithms, chunked