[Ethereum] Convert Ether to Wei without web3

A function cannot be called unless it was defined in the same file or one loaded before the attempt to call it.

A function cannot be called unless it is in the same or greater scope then the one trying to call it.

You declare function fn1 in first.js, and then in second you can just have fn1();

1.js :

function fn1 (){
    alert();
}

2.js :

fn1();

index.html :

<script type="text/javascript" src="1.js"></script>
<script type="text/javascript" src="2.js"></script>

It works fine :)

You can install a block filter and only update balances when a new block arrives.

const Web3 = require('web3');

const web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));

const address = "0x9b....";

let balance = web3.eth.getBalance(address);

const filter = web3.eth.filter('latest');
filter.watch((err, res) => {
  if (err) {
    console.log(`Watch error: ${err}`);
  } else {
    // Update balance
    web3.eth.getBalance(address, (err, bal) => {
      if (err) {
        console.log(`getBalance error: ${err}`);
      } else {
        balance = bal;
        console.log(`Balance [${address}]: ${web3.fromWei(balance, "ether")}`);
      }
    });
  }
});