How to withdraw Other ERC20 tokens besides Ethereum from my contract

Question

I'm trying to implement something like this (which works)

function withdraw() public {
    msg.sender.transfer(address(this).balance)
}

but I need to be able to withdraw ERC20 tokens other than Ethereum from my contract, is this possible? I can't seem to figure it out.

Thanks!

Answer 1

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

function withdrawErc20(IERC20 token) public {
  require(token.transfer(msg.sender, token.balanceOf(address(this))), "Transfer failed");
}

See IERC20 for the interface code. Copy & paste it or install it via npm.