export function LastIndex(s: string, sep: string): number {
  //      discuss at: https://locutus.io/golang/strings/LastIndex
  // parity verified: Go 1.23
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //        input by: GopherJS (https://www.gopherjs.org/)
  //       example 1: LastIndex('go gopher', 'go')
  //       returns 1: 3
  //       example 2: LastIndex('go gopher', 'rodent')
  //       returns 2: -1

  return s.lastIndexOf(sep)
}