Ethereum Cookbook

How to do it...

1. Loops can be very tricky when it comes to solidty. There are two very common mistakes that anyone can easily overlook while writing smart contracts.
2. Create a function that uses a for loop to iterate through an array of addresses and transfer the payout:

pragma solidity ^0.4.24;contract Payout {    // Arbitrary length array to store addresses    address[] private addresses;        // Mapping to store payout value    mapping (address => uint) public payouts;        // Function to transfer payouts    function payoutAll() public {        for(uint8 i = 0; i < addresses.length; i++) {            require(addresses[i].send(payouts[addresses[i]]));        }    }}

3. The contract contains two potential bugs, which will arise when the length of the array exceeds a certain limit.
4. For example, ...