function makeCigarString(cigarOps: Array<CigarOp>) {
  return cigarOps.map(({op, length}) => length + op).join('');
}
function makeCigarString(cigarOps: Array<CigarOp>) {
  return cigarOps.map(({op, length}) => length + op).join('');
}
function makeCigarString ( cigarOps : Array < CigarOp > ) { return cigarOps . map ( ( { op , length } ) => length + op ) . join ( '' ) ; }
builds a cigarString string that is useful to users.
builds a cigarString string that is useful to users .