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Base Learn Roles - 5

SCD ERC721 Pin NFT Contract Code:// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.23; import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; contract Submission is ERC721 { struct Haiku { address author; string line1; string line2; string line3; } uint public counter; mapping(uint256 => Haiku) private haikus; mapping(bytes32 => bool) private line1Hashes; mapping(address => uint256[]) private sharedHaikus; error HaikuNotUnique(); error NotYourHaiku(uint256 tokenId); error NoHaiku...

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Mastering Base Learn Roles: From Newcomer to Supreme

The Base ecosystem is growing faster than ever, and the Base Guild roles on Discord have become a fun and rewarding way to get involved. By completing smart contract challenges on the Base Sepolia testnet, you can unlock roles that not only reflect your progress but may also bring benefits in the community. In this blog post, we will go step by step through all five Base Learn roles, starting with Newcomer and ending with the ultimate title, Supreme. Role 1: Base Learn NewcomerThe very first ...

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Base Learn Roles - 4

Error Triage Pin NFT Contract Code:// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.23; interface ISubmission { function diffWithNeighbor( uint _a, uint _b, uint _c, uint _d ) external pure returns (uint[] memory); function applyModifier( uint _base, int _modifier ) external pure returns (uint); function popWithReturn() external returns (uint); function addToArr(uint _num) external; function getArr() external view returns (uint[] memory); function resetArr() external; } contract Su...

Mappings Pin NFT Contract Code: // SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.23; interface ISubmission { function getApprovedRecords() external view returns (string[] memory); function addRecord(string memory _albumName) external; function getUserFavorites( address _address ) external view returns (string[] memory); function resetUserFavorites() external; } contract Submission is ISubmission { mapping(address => string[]) public userFavorites; function getApprovedRecords() exte...

Base Learn Roles -2

Storage Pin NFT Contract Codes // SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.23; contract EmployeeStorage { string public name; uint public idNumber; uint24 private salary; uint16 private shares; constructor() { name = "Pat"; idNumber = 112358132134; salary = 50000; shares = 1000; } function grantShares(uint16 _newShares) external { require(_newShares <= 5000, "Too many shares"); shares += _newShares; } function checkForPacking(uint _slot) external view returns (uint result) { a...

Base Learn Roles - 1

// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.23; interface IBasicContractTest { function adder( uint _a, uint _b ) external returns (uint result, bool success); function subtractor( uint _a, uint _b ) external returns (uint result, bool success); } contract SafeMathContract is IBasicContractTest { function adder( uint _a, uint _b ) external pure override returns (uint result, bool success) { if (type(uint).max - _a < _b) { return (0, true); } else { result = _a + _b; return (re...

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