Solidity function which concatenates the bytes array items

concatBytes.js

/**
 * @dev Returns primitive bytes type from an array of bytes.
 * @param items The bytes array.
 */
function concatBytes(bytes[] memory items)
  private
  pure
  returns(bytes memory)
{
  bytes memory data = items[0];
  for (uint i = 1; i < items.length; i++) {
    data = abi.encodePacked(data, items[i]);
  }
  return data;
}