Mission 1

Enlist for project Alpha Centauri!

Mission Incomplete

You pause for a moment, breathing in the crisp, recycled air of the space academy. A sense of pride stirs within you, paired with the eagerness to move on to the next mission. Your eyes wander to a poster hanging on the hallway wall nearby: it depicts a massive space station orbiting a ringed planet, with three moons gleaming in the distance. Bold text beneath the image reads: "Enlist for Project Alpha Centauri today!"

Smart Contract

In this mission you will be creating a smart contract to enlist for the outpost in Alpha Centauri.

1Environment Setup

Before you begin, make sure you are in the proper branch.

Clone the repository:

git clone https://github.com/kmjones1979/graphbuilders-basecamp mission-1-enlist

Navigate into the project directory:

cd mission-1-enlist

Checkout the branch:

git checkout mission-1-enlist

Install the dependencies:

yarn install

Start your local blockchain:

yarn chain

2Deploy Contract

(In a new terminal)

yarn deploy

3Start Frontend

(In a new terminal)

yarn start

4Starting Contract Code

The starting smart contract code for this mission is as follows:

contract Enlist {

    mapping(address => bool) public isEnlisted;

    function enlist() public {
        require(!isEnlisted[msg.sender], "You are already enlisted");
        isEnlisted[msg.sender] = true;
    }

}

This basic contract allows a wallet to enlist themselves. You can check the current enlistment of a wallet by using the "Debug Contracts" tab in the header and checking the isEnlisted mappings value for your wallet address. You can also call the enlist() function on that page as well.

5Add an event to track addresses which have enlisted

To complete this task, follow these steps:

  • Navigate to packages/hardhat/contracts and open the file Enlist.sol
  • Add an event called Enlisted that will emit an address
  • Use the event by calling the emit keyword inside the enlist() function
👉🏼 Look at this page if you get lost... Solidity-by-Example (Events) 🔎

6Deploy your changes:

yarn deploy --reset

7✅ Success will look like this:

deployed at 0x2279B7A0a67DB372996a5FaB50D91eAA73d2eBe6 with 283218 gas

Since this will be a new contract that is deployed, you will need to enlist on the main page or using "Debug Contracts" tab. If you were successful, continue with the next part of the mission.

Need Help?

Join the telegram channel for this mission:

🗒 Mission 1: Alpha Centauri 🚀