sheetjs_sheetjs/demos/altjs/main.swift

/* xlsx.js (C) 2013-present  SheetJS -- http://sheetjs.com */

let sheetjs = try SheetJSCore();

try print(sheetjs.version());

let filenames: [[String]] = [
  ["xlsx", "xlsx"],
  ["xlsb", "xlsb"],
  ["biff8.xls", "xls"],
  ["xml.xls", "xlml"]
];

for fn in filenames {
  let wb: SJSWorkbook = try sheetjs.readFile(file: "sheetjs." + fn[0]);
  let ws: SJSWorksheet = try wb.getSheetAtIndex(idx: 0);
  let csv: String = try ws.toCSV();
  print(csv);
  let wbout: String = try wb.writeBStr(bookType: fn[1]);
  try wbout.write(toFile: "sheetjsswift." + fn[0], atomically: false, encoding: String.Encoding.isoLatin1);
}