Ethereum Cookbook

How to do it...

1. Consider the following token contract as an example for debugging. This contract is for illustration purposes only. Never use it in your 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 addr) public view returns(uint) {    return balances[addr];  }}

2. Let's try to debug the sendToken function. ...