To Do List Contract
mkdir eth-todo-list
cd eth-todo-list
truffle init
touch package.json
package.json
{
"name": "eth-todo-list",
"version": "1.0.0",
"description": "Blockchain Todo List Powered By Ethereum",
"main": "truffle-config.js",
"directories": {
"test": "test"
},
"scripts": {
"dev": "lite-server",
"test": "echo \"Error: no test specified\" && sexit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
"bootstrap": "4.1.3",
"chai": "^4.1.2",
"chai-as-promised": "^7.1.1",
"chai-bignumber": "^2.0.2",
"lite-server": "^2.3.0",
"nodemon": "^1.17.3",
"truffle": "5.0.2",
"truffle-contract": "3.0.6"
}
}
npm install
touch ./contracts/TodoList.sol
// Some code
pragma solidity ^0.5.0;
contract TodoList {
uint public taskCount = 0;
struct Task {
uint id;
string content;
bool completed;
}
mapping(uint => Task) public tasks;
event TaskCreated(
uint id,
string content,
bool completed
);
event TaskCompleted(
uint id,
bool completed
);
constructor() public {
createTask("Visit vexanium.com");
}
function createTask(string memory _content) public {
taskCount ++;
tasks[taskCount] = Task(taskCount, _content, false);
emit TaskCreated(taskCount, _content, false);
}
function toggleCompleted(uint _id) public {
Task memory _task = tasks[_id];
_task.completed = !_task.completed;
tasks[_id] = _task;
emit TaskCompleted(_id, _task.completed);
}
}v
Last modified 6mo ago