A 1904x960 PNG rendering of the function in the CryptoPhunksMarket contract that allows users to withdraw ETH from sales.
It contains a helpful comment about avoiding re-entrancy attacks. If you're anything like me, when you read this code for the first time you thought "what's a re-entrancy attack"?
And then if you read it's a bit terrifying—when you send ETH with `transfer()` you need to have your contract's state indicate "this user is not allowed to withdraw more" *before* you send the ETH. Otherwise you lose all your money.
This is wild because in every other case intra-function code ordering doesn't matter in Solidity.
These days, the standard way to send ETH is this tongue twister: `(bool success, ) = msg.sender.call{value: amount}("")`, which actually generates a compiler warning.
Anyway, a true work of art, has probably saved devs millions, available for the first time ever in PNG form. All proceeds go toward furthering the Phunk movement through technology!
