Ethereum Cookbook

How to do it...

1. Consider the following contract as an example for this recipe. This is a simple token contract with a feature to transfer tokens and check the balance of each address. The contract is only for illustration purposes, so don't use it in your production application:

pragma solidity ^0.4.23;contract TokenContract {  mapping (address => uint) balances;  event Transfer(address indexed _from, address indexed _to, uint256 _value);  constructor() public {    balances[msg.sender] = 100000;  }  function sendToken(address receiver, uint amount) public returns(bool) {    require(balances[msg.sender] < amount);    balances[msg.sender] -= amount;    balances[receiver] += amount;    emit Transfer(msg.sender, receiver, amount);    return true;  } function getBalance(address ...