Truffle Console error : invalid number value. Value must be an integer, while executing commands from a tutorial

Question

I am trying to execute commands from the following tutorial:

medium Dev Tutorial

I am getting an integer error while executing a command:

truffle(ganache)> balanceInEth = address => web3.utils.fromWei(getBalance(address).toString(), 'wei')

[Function: balanceInEth]

truffle(ganache)> balanceInEth(victim.address)

/usr/local/lib/node_modules/truffle/build/cli.bundled.js:57187 throw new Error('[number-to-bn] while converting number ' + JSON.stringify(arg) + ' to BN.js instance, error: invalid number value. Value must be an integer, hex string, BN or BigNumber instance. Note, decimals are not supported.');

Somebody please guide me.

Zulfi.

Answer 1

Looking at the medium article you've referred, it looks like the balanceInEth function is just a reference to web3.eth.getBalance. The function returns a Promise which resolves into a string.

getBalance(address).toString() would convert the Promise into a string and not the result returned by the Promise. You can use async-await to wait for the promise to complete.

balanceInEth = async(address) => web3.utils.fromWei(await getBalance(address))