Where to find implementation of a method for a contract on which I am calling its method

[Hiren879]

Scenario:
I want to convert ETH to USD for which I am using interface AggregatorV3Interface and contract which provides this conversion for ETH-USD on Rinkeby test-net is: 0x8A753747A1Fa494EC906cE90E9f37563A8AF630e

I can see the following code to implement this functionality.

AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
(, int256 price,,,) = priceFeed.latestRoundData();

My understanding:
I am using AggregatorV3Interface interface to call the method which, I assume, will be implemented by the contract 0x8A753747A1Fa494EC906cE90E9f37563A8AF630e somewhere.

Question:
Where can I find if this contract 0x8A753747A1Fa494EC906cE90E9f37563A8AF630e has implemented this method and its logic.

[RoboCrypter]

@Hiren879 : This contract 0x8A753747A1Fa494EC906cE90E9f37563A8AF630e is a ETH/USD price feed address of rinkeby!

Therefore rinkeby is been depriciated!

I would suggest you to use goerli ETH/USD price feed address this one : 0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e

Change your current price feed address with the goerli tesnet price feed I provided above!

And you can find this ETH/USD price feed in Chainlink Docs - Ethereum Data Feeds under Goerli Testnet on this link :

https://docs.chain.link/docs/ethereum-addresses/#Goerli%20Testnet

[Hiren879]

Thanks for the answer.
I was knowing this but the thing I was not aware of where to find the source code of this implementation.

[RoboCrypter]

@Hiren879 : Ahh, I didn't understand that! But that link is down below!

[Hiren879]

Yeah. :)
Thanks.

[alymurtazamemon]

@Hiren879 Here it is LINK

[Hiren879]

Thanks. That's what I was looking for.

[Hiren879]

But I really am confused, how one will get to know that the data he wants via Oracle in his own smart contract is already available via some interface and someone has already written the whole business logic for it?
Example:
In java, I know we have StringUtils library to perform operations on String.
How can I know the same in Solidity?

[alymurtazamemon]

@Hiren879 Documentation.