slight difference between video and code. why? (virtual & override)

[RAJA]

function store(uint256 _favoriteNumber) public virtual override { - is in this git

but in tutorial, it was just

function store(uint256 _favoriteNumber) public override {

why

[Patrick Collins]

The virtual keyword is in the video too... I just moved too quick when adding it :/

You need virtual to tell our ExtraStorage contract that it is allowed to override the function. Without the virtual keyword, we can't override the function.