function continuationArg(args, argcount) {
  argcount = argcount || 0;
  if (args.length <= argcount || typeof(args[args.length - 1]) != 'function') {
    return null;
  }
  return args[args.length - 1];
}
// if the argument list is longer than argcount, or null otherwise.
if the argument list is longer than argcount, or null otherwise.
if the argument list is longer than argcount or null otherwise .
function continuationArg(args, argcount) {
  argcount = argcount || 0;
  if (args.length <= argcount || typeof(args[args.length - 1]) != 'function') {
    return null;
  }
  return args[args.length - 1];
}
function continuationArg ( args , argcount ) { argcount = argcount || 0 ; if ( args . length <= argcount || typeof ( args [ args . length - 1 ] ) != 'function' ) { return null ; } return args [ args . length - 1 ] ; }
if the argument list is longer than argcount, or null otherwise.
if the argument list is longer than argcount or null otherwise .