gistfile1.swift

import Foundation

let content = "abc,cde,5.5,128,256\nefg,ghi,42"

let parsedCSV: [[CustomStringConvertible]] = content
  .components(separatedBy: "\n")
  .map({ // Step 1
    $0.components(separatedBy: ",")
      .map({ // Step 2
        if let int = Int($0) {
          return int
        } else if let double = Double($0) {
          return double
        }
        return $0
      })
  })


print(parsedCSV)
// [["abc", "cde", 5.5, 128, 256], ["efg", "ghi", 42]]