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Initiate a transfer transaction

The following example demonstrates how a transfer transaction may be initiated.

const wallet = AElf.wallet.createNewWallet();
let tokenContract;
// Use token contract for examples to demonstrate how to get a contract instance in different ways
// in async function
(async () => {
  tokenContract = await aelf.chain.contractAt(tokenContractAddress, wallet);
})();

// promise way
aelf.chain.contractAt(tokenContractAddress, wallet).then((result) => {
  tokenContract = result;
});

// callback way
aelf.chain.contractAt(tokenContractAddress, wallet, (error, result) => {
  if (error) throw error;
  tokenContract = result;
});

(async () => {
  // get the balance of an address, this would not send a transaction,
  // or store any data on the chain, or required any transaction fee, only get the balance
  // with `.call` method, `aelf-sdk` will only call read-only method
  const result = await tokenContract.GetBalance.call({
    symbol: "ELF",
    owner: "XXX",
  });
  console.log(result);
  /**
      {
        "symbol": "ELF",
        "owner": "XXX",
        "balance": "1000000000000"
      }*/
  // with no `.call`, `aelf-sdk` will sign and send a transaction to the chain, and return a transaction id.
  // make sure you have enough transaction fee `ELF` in your wallet
  const transactionId = await tokenContract.Transfer({
    symbol: "ELF",
    to: "XXX",
    amount: "1000000000",
    memo: "transfer in demo",
  });
  console.log(transactionId);
  /**
        {
          "TransactionId": "123123"
        }
      */
})();