index.js
function append() {
  var acc = nil;
  for (var i = 0; i < arguments.length; i++) {
    acc = acc.append(arguments[i]);
  }
  return acc;
}
function append() {
  var acc = nil;
  for (var i = 0; i < arguments.length; i++) {
    acc = acc.append(arguments[i]);
  }
  return acc;
}
- *append : (xs... : Array a | Seq a | () → Array a | () → Seq a) → Seq a* : Append one sequence-like to another.