Cross Chain Tutorial L2 Counter Part 2

Deploy L2 Counter Contract

1. Create a new file inside the scripts folder named deploy.ts.

   touch scripts/deploy.ts
   

2. Copy/paste the following code into L2-counter/scripts/deploy.ts, replacing <GOVERNANCE-ADDRESS> with the address of the Governance contract we just deployed:
   L2-counter/scripts/deploy.ts

   import { ethers, network } from 'hardhat';
   import { utils } from 'zksync-ethers';
   
   const GOVERNANCE_ADDRESS = process.env.GOVERNANCE_ADDRESS ?? '<GOVERNANCE-ADDRESS>';
   
   async function main() {
     const CONTRACT_NAME = 'Counter';
     const ARGS = [utils.applyL1ToL2Alias(GOVERNANCE_ADDRESS)];
     console.log(`Deploying ${CONTRACT_NAME} contract to ${network.name}`);
     const contract = await ethers.deployContract(CONTRACT_NAME, ARGS, {});
     await contract.waitForDeployment();
     const contractAddress = await contract.getAddress();
     console.log(`${CONTRACT_NAME} deployed to ${contractAddress}`);
   }
   
   main()
     .then(() => process.exit(0))
     .catch((error) => {
       console.error(error);
       process.exit(1);
     });
   

3. Now deploy the contract from the L2-counter/ folder root to ZKsync Era Sepolia:
   npmyarnpnpmbun

   npm run deploy
   

   
   You should see an output like this:

   Deploying Counter contract to ZKsyncEraSepolia
   Counter deployed to 0x111C3E89Ce80e62EE88318C2804920D4c96f92bb
   

Read the Counter Value

Now both contracts are deployed, we can create a script to retrieve the value of the counter.

1. Create a new file in the scripts folder named display-value.ts.

   touch scripts/display-value.ts
   

2. Copy and paste in the following code, adding the deployed counter contract address:
   L2-counter/scripts/display-value.ts

   import { ethers } from 'hardhat';
   
   async function main() {
     const COUNTER_ADDRESS = process.env.COUNTER_ADDRESS ?? '<COUNTER_ADDRESS>';
   
     const [signer] = await ethers.getSigners();
     const counterFactory = await ethers.getContractFactory('Counter');
     const counterContract = counterFactory.connect(signer).attach(COUNTER_ADDRESS);
   
     const value = (await counterContract.value()).toString();
     console.log(`The counter value is ${value}`);
   }
   
   main()
     .then(() => process.exit(0))
     .catch((error) => {
       console.error(error);
       process.exit(1);
     });
   

3. Run the script:
   npmyarnpnpmbun

   npx hardhat run ./scripts/display-value.ts
   

   
   The output should be:

   The counter value is 0