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