Lesson 2: TypeError: Data location must be "memory" or "calldata" for return parameter in function, but none was given.

[Boluwatife-Aminu-Taiwo]

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.8;

import "./Practice.sol";
contract Practice2{

    Practice[] public practiceArray;

    function createNewPracticeContract() public {
        Practice practice2 = new Practice();
        practiceArray.push(practice2);
    }


    function storeName(string memory _addressName, uint256 _practice2Index ) public {
        practiceArray[_practice2Index].store(_addressName);
    }

    function nameGet(uint256 _practice2Index) public view returns(string){  
        return practiceArray[_practice2Index].retrieve();
    } **// this is where the error is** 
}

[alymurtazamemon]

@devtiff

- function nameGet(uint256 _practice2Index) public view returns(string){  
+ function nameGet(uint256 _practice2Index) public view returns(string memory){  

Add memory keyword along with the string in returns

[Boluwatife-Aminu-Taiwo]

@alymurtazamemon

it giving me :
TypeError: Wrong argument count for function call: 1 arguments given but expected 2.

function storeName(string memory _addressName, uint256 _practice2Index ) public {
practiceArray[_practice2Index].store(_addressName); // its giving me error here
}

[alymurtazamemon]

@devtiff Please add both your contract at top, it will be easy to tell you about errors.

[alymurtazamemon]

@devtiff And why you have added ** at the end

[krakxn]

^

[krakxn]

Incorporate Ali's fix which adds the memory keyword, that should fix it.

If it persists, please post the terminal as well as the entire code--we will look into it!

[Boluwatife-Aminu-Taiwo]

These are the codes

Practice.sol

pragma solidity ^0.8.8;

contract Practice{

    uint256 public num1;
    uint256 public num2;

    mapping (string => uint256) public nameToNumber;
    mapping (string => bool) public nameToIsRegistered;

    function store(uint256 _num1, uint256 _num2) public {
        num1 = _num1;
        num2 = _num2;

    }

    function multiply() public view returns(uint256){
        return num1 * num2;
    }

    struct Info {
        string name;
        uint256 number;
        bool isRegistered;
    }

    Info[] public walletInfo;

    function addInfo(string memory _name, uint256 _number, bool _isRegistered) public {
        walletInfo.push(Info(_name, _number, _isRegistered));

        nameToNumber[_name] = _number;
        nameToIsRegistered[_name] = _isRegistered;
    }


}

Practice2.sol

pragma solidity ^0.8.8;

import "./Practice.sol";
contract Practice2{

    Practice[] public practiceArray;

    function createNewPracticeContract() public {
        Practice practice2 = new Practice();
        practiceArray.push(practice2);
    }


    function storeName(string memory _addressName, uint256 _practice2Index ) public {
        practiceArray[_practice2Index].store(_addressName);
    }

    function nameGet(uint256 _practice2Index) public view returns(string memory){
        return practiceArray[_practice2Index].retrieve();
    }
}

[Boluwatife-Aminu-Taiwo]

When i added memory to function nameGet (i.e returns(string memory)) it gave me an error in function storeName @alymurtazamemon @krakxn

[alymurtazamemon]

@devtiff Yes store function takes 2 parameter but you are passing only 1

[Boluwatife-Aminu-Taiwo]

Thank you. I got it now