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Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.18+commit.87f61d96.js&optimize=false&runs=200&gist=
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| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.0; | |
| contract POE{ | |
| bytes32 private hashed; | |
| bytes32 [] public files; | |
| bool private state; | |
| uint private index; | |
| function exists(string memory _poe) external returns (bool){ | |
| hashed = keccak256(abi.encodePacked(_poe)); | |
| uint arrayLength = files.length; | |
| state = false; | |
| for (uint i=0; i<arrayLength; i++) { | |
| if (files[i] == hashed) { | |
| state = true; | |
| break; | |
| } | |
| } | |
| return state; | |
| } | |
| function show () external view returns (bytes32){ | |
| return hashed; | |
| } | |
| function add (string memory _poe) external { | |
| files.push(keccak256(abi.encodePacked(_poe))); | |
| } | |
| } |
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