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const displayGreeting = async (greeting, contract) => { greeting = await contract.methods.sayHello().call(); $("h2").html(greeting); }; const updateGreeting = (greeting, contract, accounts) => { let input; $("#input").on("change", (e) => { input = e.target.value; }); $("#form").on("submit", async (e) => { e.preventDefault(); await contract.methods .updateGreeting(input) .send({ from: accounts[0], gas: 40000 }); displayGreeting(greeting, contract); }); }; async function greetingApp() { const web3 = await getWeb3(); const accounts = await web3.eth.getAccounts(); const contract = await getContract(web3); let greeting; displayGreeting(greeting, contract); updateGreeting(greeting, contract, accounts); } greetingApp()