How to use the 0x.js.assetDataUtils.encodeERC721AssetData function in 0x

web3Wrapper,
        contractWrappers,
        { maker, taker },
        { WETH: etherTokenAddress, ZRX: zrxTokenAddress },
    );
    printUtils.printAccounts();

    // the amount the maker is selling of maker asset (1 set of ERC721 Token and ERC20 tokens)
    // when set to 1, this order cannot be partially filled.
    const makerAssetAmount = new BigNumber(1);
    // the amount the maker wants of taker asset
    const takerAssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(0.1), DECIMALS);
    // Generate a random token id
    const tokenId = generatePseudoRandomSalt();
    // 0x v2 uses hex encoded asset data strings to encode all the information needed to identify an asset
    const erc721AssetData = assetDataUtils.encodeERC721AssetData(dummyERC721TokenContract.address, tokenId);
    const erc20AssetData = assetDataUtils.encodeERC20AssetData(zrxTokenAddress);
    const erc20AssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(0.2), DECIMALS);
    // combine both the ERC721 asset data and the ERC20 asset data into multi asset data
    // the order is exchanging 1 ERC721 and 0.2 ZRX in exchange for 0.1 WETH
    const makerAssetData = assetDataUtils.encodeMultiAssetData(
        [makerAssetAmount, erc20AssetAmount],
        [erc721AssetData, erc20AssetData],
    );
    const takerAssetData = assetDataUtils.encodeERC20AssetData(etherTokenAddress);
    let txHash;

    const zrxToken = new ERC20TokenContract(zrxTokenAddress, providerEngine);
    // Mint a new ERC721 token for the maker
    const mintTxHash = await dummyERC721TokenContract.mint.validateAndSendTransactionAsync(maker, tokenId, {
        from: maker,
    });

}

    // Initialize the Web3Wrapper, this provides helper functions around fetching
    // account information, balances, general contract logs
    const web3Wrapper = new Web3Wrapper(providerEngine);
    const [maker, taker] = await web3Wrapper.getAvailableAddressesAsync();
    const printUtils = new PrintUtils(web3Wrapper, contractWrappers, { maker, taker }, { WETH: etherTokenAddress });
    printUtils.printAccounts();

    // the amount the maker is selling of maker asset: 1 ERC721 Token
    const makerAssetAmount = new BigNumber(1);
    // the amount the maker is selling of maker asset
    const takerAssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(0.1), DECIMALS);
    const tokenId = generatePseudoRandomSalt();
    // 0x v2 uses hex encoded asset data strings to encode all the information needed to identify an asset
    const makerAssetData = assetDataUtils.encodeERC721AssetData(dummyERC721TokenContract.address, tokenId);
    const takerAssetData = assetDataUtils.encodeERC20AssetData(etherTokenAddress);
    let txHash;

    // Mint a new ERC721 token for the maker
    const mintTxHash = await dummyERC721TokenContract.mint.sendTransactionAsync(maker, tokenId, { from: maker });
    await printUtils.awaitTransactionMinedSpinnerAsync('Mint ERC721 Token', mintTxHash);
    // Allow the 0x ERC721 Proxy to move ERC721 tokens on behalf of maker
    const isApproved = true;
    const makerERC721ApprovalTxHash = await dummyERC721TokenContract.setApprovalForAll.validateAndSendTransactionAsync(
        contractAddresses.erc721Proxy,
        isApproved,
        { from: maker },
    );
    await printUtils.awaitTransactionMinedSpinnerAsync('Maker ERC721 Approval', makerERC721ApprovalTxHash);

    // With the Forwarding contract, the taker requires 0 additional set up

// Initialize the Web3Wrapper, this provides helper functions around fetching
    // account information, balances, general contract logs
    const web3Wrapper = new Web3Wrapper(providerEngine);
    const [maker, taker] = await web3Wrapper.getAvailableAddressesAsync();

    const printUtils = new PrintUtils(web3Wrapper, contractWrappers, { maker, taker }, { WETH: etherTokenAddress });
    printUtils.printAccounts();

    // the amount the maker is selling of maker asset (1 ERC721 Token)
    const makerAssetAmount = new BigNumber(1);
    // the amount the maker wants of taker asset
    const takerAssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(0.1), DECIMALS);
    // Generate a random token id
    const tokenId = generatePseudoRandomSalt();
    // 0x v2 uses hex encoded asset data strings to encode all the information needed to identify an asset
    const makerAssetData = assetDataUtils.encodeERC721AssetData(dummyERC721TokenContract.address, tokenId);
    const takerAssetData = assetDataUtils.encodeERC20AssetData(etherTokenAddress);
    let txHash;

    // Mint a new ERC721 token for the maker
    const mintTxHash = await dummyERC721TokenContract.mint.sendTransactionAsync(maker, tokenId, { from: maker });
    await printUtils.awaitTransactionMinedSpinnerAsync('Mint ERC721 Token', mintTxHash);

    const erc721Token = new ERC721TokenContract(dummyERC721TokenContract.address, providerEngine);
    // Allow the 0x ERC721 Proxy to move ERC721 tokens on behalf of maker
    const makerERC721ApprovalTxHash = await erc721Token.setApprovalForAll.validateAndSendTransactionAsync(
        contractAddresses.erc721Proxy,
        true,
        { from: maker },
    );
    await printUtils.awaitTransactionMinedSpinnerAsync('Maker ERC721 Approval', makerERC721ApprovalTxHash);