Lesson 9: Hardhat Smart Contract Lottery ((bool success, ))

[SerjSch]

Hi!

(bool success, ) = recentWinner.call{value: address(this).balance}("");

contracts/Raffle.sol

What is it mean?

[othaime-en]

In solidity, we use the .call functionality as one way to send funds from one account to another. In this case, we are sending address(this).balance (the balance of our contract) to the recentWinner. Using .call returns two parameters and the first is a TRUE/FALSE value depending on whether the transaction (sending funds to the recentWinner) has suceeded or failed. We then store this value in a bool type variable called success
Afterwards in the next lines of code, we check to see if the success value was true or false. If it was false, meaning that the transaction failed then we can throw an error and revert saying that the transaction failed

if (!success) {
        revert Raffle__TransferFailed();
    }

[SerjSch]

Thanks