Gas Golf Challenge: Assigning Values in Constructor vs In-Contract

@MatheusDaros

Conclusion: Assigning variable values inside the contract is cheaper.

Possible Reason: There may be additional deployment overhead b/c we're placing additional data in the constructor.

Hardhat Gas Reporter

Assign Globals in Constructor

$ yarn ts-node scripts/define-constructor-deploy.ts
Using address 0x9E3...e03A
Wallet balance 9.978686068922924
Awaiting confirmations
Token Contract Address: 0x82e5Ec2A9F8744E87d91A2baB2663DAFE5770fF7
Wallet AFTER before deploying 9.978530472422198

9.978686068922924-9.97837653492148 Gas Cost = 3.09534e-3

Assign Globals in Contract

$ yarn ts-node scripts/define-contract-deploy.ts
Using address  0x9E3...e03A
Wallet balance before deploying 9.978530472422198
Awaiting confirmations
Token Contract Address: 0xe01e9D582fd962084ef42cB2C33b6dDA3789588E
Wallet AFTER before deploying 9.97837653492148

9.978530472422198-9.97837653492148 Gas Cost = 1.539375e-3

Resources

1. Estimate gas cost to deploy a smart contract with ethers.js

const deploymentData = contract.interface.encodeDeploy([<constructor_arguments>]) Then, you could use the data to get the estimated gas limit as follows:

const estimatedGas = await ethers.provider.estimateGas({ data: deploymentData });

the above code will give you the gas limit, you would need to multiply it with the current network gas price in order to get the fee in ETH.

2. Estimate gas fees for smart contract function call with Ethers.js

First, you must get the estimated gas price to use in an empty transaction:

const gasPrice = await provider.getFeeData();

Then, get the estimated gas price for your specific transaction, and multiply it by gasPrice:

const functionGasFees = await contract.estimateGas.myFunction(<argument>);
const finalGasPrice = gasPrice * functionGasFees;

Of course, finalGasPrice will never be exactly equal to the actual gas price you will end up paying, but it is a close enough estimate.

3. @ricmoo comment on using getFeeData() since getGasPrice() has been deprecated: ethers-io/ethers.js#2439 (reply in thread)

4. getFeeData() ethers.js docs: https://docs.ethers.io/v5/api/providers/provider/#Provider-getFeeData

5. Class 9 Example with gasUsed() effectiveGasPrice() from transaction receipt

    const BLOCK_GAS_LIMIT = 30000000;
    //
    // ..additional code
    //
    const sortTx = await ballotContract.sortProposals(STEP_SIZE); // Call any f(x) here
    console.log("Awaiting confirmations");
    const sortReceipt = await sortTx.wait();
    console.log("Operation completed");
    const percentUsed = sortReceipt.gasUsed
      .mul(100)
      .div(BLOCK_GAS_LIMIT)
      .toNumber();
    console.log(
      `${sortReceipt.gasUsed} units of gas used at ${ethers.utils.formatUnits(
        sortReceipt.effectiveGasPrice,
        "gwei"
      )} GWEI effective gas price, total of ${ethers.utils.formatEther(
        sortReceipt.effectiveGasPrice.mul(sortReceipt.gasUsed)
      )} ETH spent. This used ${percentUsed} % of the block gas limit`
    );

6. Basics of Smart Contract Gas Optimization with Solidity

7. Meme from @vplasencia

   

How to Create a New Hardhat Project Using Yarn Berry

yarn set version berry
yarn --version
yarn add --dev [email protected] #yarn 2.10.x breaks when using yarn berry
yarn hardhat

Then choose: Create an advanced sample project that uses TypeScript

Make Sure Everything Is Working: Lodash and Process

yarn hardhat test

1. If you get an error the following lodash error:

An unexpected error occurred:

Error: @typechain/hardhat tried to access lodash (a peer dependency) but it isn't provided 
by your application; this makes the require call ambiguous and unsound.

Required package: lodash

Follow the instructions and install lodash:

yarn add lodash

2. If process.env is redlined and says Cannot find name 'process'. Do you need to install type definitions for node?

Do:

yarn add dotenv
yarn install