I defined a function in Solidity:
function store(uint256 _favoriteNumber) public {}
Then call the function with argument 7 in JavaScript:
contract.store(7);
But, according to the Patrick Collins JS video, it's better to wrap number 7 with quotes like this:
contract.sotre("7");
So here are two things confused me:
Javascript supports a smaller set of numbers than Solidity. Specificially, the maximal safe value in JS is 2^53 - 1, while the maximal numeric value in Solidity is 2^256.
So if you were to for example transfer 1 token with 18 decimals, the resulting decimal value that you'd need to pass to the Solidity contract is 1000000000000000000 - which is somewhere between 2^59 and 2^60, already higher than the maximal safe JS integer of 2^53 - 1.
For this reason, ethers.js and other JS smart contract libraries accept numeric values either as native JS string or an instance of a helper library called BigNumber - but not as integers.
Note: Some libraries in some versions might be able to convert the native integer to a string or BigNumber at first. But generally, it's always safer to pass the non-integer values.