Lesson 3 understanding help

[Inc8g]

I'd highly appreciate it if someone could go over my comments and help explain if my understanding is correct or wrong because I'm a bit confused with the process and want to make sure my understanding is correct before I move on

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./SimpleStorage.sol"; //imports the contract and updates when the file is changed instead of being static

contract StorageFactory{
    SimpleStorage[] public simpleStorageArray; // creates an array to store contracts
    function createSimpleStorageContract() public{
        SimpleStorage simpleStorage = new SimpleStorage(); // creates a new contract of type SimpleStorage but what does that mean? it takes on the same attributes as the originally created contract?
        simpleStorageArray.push(simpleStorage); // pushes the newly created contract to the array?
    }

    function sfStore(uint _simpleStorageIndex, uint256 _simpleStorageNumber) public{ // what are these variables used to store/lookup? the contract in the array?
        // Address
        // ABI - Application Binary Interface
        SimpleStorage simpleStorage = simpleStorageArray[_simpleStorageIndex]; //grabs the contract from the array of the inputed index number?
        simpleStorage.store(_simpleStorageNumber); //grabs the favourite number?
    }

    function sfGet(uint256 _simpleStorageIndex) public view returns(uint256){
        return simpleStorageArray[_simpleStorageIndex].retrieve(); // allows us to view the data within the created contract? why is this sfGet function needed?
    }
}

[alymurtazamemon]

@Inc8g

1. //imports the contract and updates when the file is changed instead of being static

If we have a contract in another file and we want to use it to other file then we need to import it.

2. // creates a new contract of type SimpleStorage but what does that mean? it takes on the same attributes as the originally created contract?

Yes,

3. // what are these variables used to store/lookup? the contract in the array?

index variable is to find the contract from an array, and number is a number that we will store in that contract.

4. //grabs the favourite number?

Nope!, store the number.

5. // allows us to view the data within the created contract? why is this sfGet function needed?

We want to use the StorageFactory contract as a main contract, that will do all things, creating a contract, storing a number and retrieving a number.

All the others that I have leaved are correct.

[Inc8g]

Thank you Ali,

on 3-4 what number is stored? I thought it was storing the favourite number inside the selected contract

and I'm assuming 5 is needed to retrieve it because its out of scope?

[alymurtazamemon]

@Inc8g Number that you will pass while calling the function.

You can say it for 5. I do not want to confuse you more.