README.md

✅ TodoList Smart Contract

A simple yet powerful Ethereum smart contract to manage your daily tasks directly on the blockchain! Built using Solidity by a passionate beginner learning through YouTube tutorials and ChatGPT guidance. 🎥🤖

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🧠 What I Learned in My Second Solidity Project

After building my first wallet, I wanted to take it one step further. This TodoList taught me about structs, arrays, and more real-world logic. Here's what I picked up:

🔍 Key Concepts Understood

• ✅ How to define and use struct for creating task objects
• ✅ Storing multiple items using a Task[] dynamic array
• ✅ How public lets you view contract variables from outside
• ✅ Writing functions to add new tasks and read specific ones
• ✅ Using for loops in Solidity to search for tasks by ID
• ✅ Toggling boolean values (true ↔ false) with ! operator
• ✅ Error handling using revert()

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🛠️ Contract Features

🔧 Function	💡 What It Does
addTask()	Add a new task with description and ID
getTask()	Fetch a task’s details using its unique ID
toggleTask()	Flip task status between completed and not completed

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🧪 How to Use It (via Remix)

1. Go to Remix IDE
2. Create a new file TodoList.sol and paste the contract code
3. Compile using version 0.8.0 or above
4. Deploy to local VM or Injected Web3 (MetaMask)
5. Use the UI to:
   • 🆕 Add a task
   • 🔍 Get a task by ID
   • 🔁 Toggle a task's status (complete/incomplete)

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📦 Contract Code Snapshot

Task[] public alltasks;
uint public currentId = 1;

function addTask(string memory description) public {
    alltasks.push(Task(currentId, description, false));
    currentId++;
}