3 Questions

[OmarWaqar123]

reference 11:18:46.

can someone please answer these 3 questions.

1)While writing a test for the fund me contract why did @PatrickAlphaC use fundMe = await ethers.getContract("FundMe", deployer); instead of fundMe = await deployments.get("FundMe"); ??? which he also used previously while writing deploy script.

2)While writing the same test script but specifically for "Construct" , why did @PatrickAlphaC write const response = await fundMe.priceFeed(); when price feed is not a function but a variable in solidity FundMe contract???

 AggregatorV3Interface public priceFeed;
    constructor(address priceFeedAddress) {
        owner = msg.sender;
        priceFeed = AggregatorV3Interface(priceFeedAddress);
    }

3)also when I'm writing fundMe = await deployments.get("FundMe", deployer); for both fundMe and MockV3aggregator instead of fundMe = await ethers.getcontract("FundMe", deployer); its giving me this error TypeError: fundMe.priceFeed is not a function, but it doesn't give the same error before when writing ethers.getContract . Why??

[krakxn]

For questions, the category should be Q&A; therefore, it should be changed.

Now, as to your questions:

1. getContract("FundMe", deployer); returns the instance of the contract FundMe with the signer/interface deployer. Whereas deployments.get("FundMe") returns the latest instance of the contract FundMe.

2. For public state variables, an automatic getter function is generated by the Solidity compiler. fundMe.priceFeed(); basically works the same as a getter function, i.e. fundMe.getPriceFeed(). There is no difference between them. Both of them return the variable priceFeed in FundMe

3. If it does not work even if you importing the packages properly in your hardhat.config.js, then it can be deduced that the ethers.js library automatically creates a getter function for the public variables. (deployments is a Hardhat feature)

[OmarWaqar123]

Thanks