append.js

function append(dest) {
  for (var i = 1, n = arguments.length; i < n; i++) {
    var src = arguments[i], offset = dest.length;
    dest.length += src.length;
    for (var j = 0, l = src.length; j < l; j++) {
      dest[offset++] = src[j];
    }
  }
  return dest;
}