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parseInt(await leaseNFTContract.methods .totalLeaseOffers().call()) return Promise.all( [...Array(totalLeaseOffers + 1).keys()].map( id => leaseNFTContract.methods.allLeaseOffers(id).call() ) ) } 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 The result will be a promise that will be resolved before the action is dispatched by the action creator. Similarly, we have the function getAllLoanOffers for the LoanNFT smart contract. Before interacting with the NFT of the user we must approve our smart contracts. To do so, we have to connect to the smart contract of the token and also specify the JSON interface of the ABI which was taken for the ERC-721 implementation from OpenZeppelin. export const approveNFT = (erc721Contract, userAddress, tokenIdNFT) => { const erc721crt = new web3.eth.Contract(erc721ContractInterface, erc721Contract, {from: userAddress}); erc721crt.methods.approve(CONTRACT_ADDRESS, tokenIdNFT).send() .on('transactionHash', (hash) => { // transaction is sent }).on('receipt', (receipt) => { // transaction receipt is available }).on('confirmation', (number, confirmation) => { // called on each confirmation }).on('error', (error) => { // transaction has error }); } Listing 4.10: Example of smart function call. For each transaction, we can check their status based on the following events: [50] • transactionHash : this notifies us that the transaction has been sent and we have a transaction hash available. • receipt : this will be fired when the transaction receipt is available and the transaction will be mined. • confirmation : signals for every confirmation up to confirmation number 24. 53 Listing 4.9: Example of smart contract data retrieval.PDF Image | NFT finance Leveraging Non-Fungible Tokens
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