Smart Contracts Programming Tutorials, Guides & Best Practices

Different operations in a smart contract consume different amounts of gas. Simple operations like adding two numbers are inexpensive, while more complex operations like loops or external contract calls can be costly. It’s important to understand how various Solidity operations consume gas.

Examples of Gas Costs:

• Web3.js: A JavaScript library for interacting with the Ethereum blockchain.
• contract.methods.setMessage(message).send({ from: accounts[0] }): Calls the smart contract’s setMessage function and sends a transaction to the blockchain.
• contract.methods.getMessage().call(): Calls the smart contract’s getMessage function to retrieve the stored message.

To interact with the Ethereum network, you need to connect MetaMask to your DApp.

• Set a Value: Use the set function to store a number in the contract.
• Get the Value: Use the get function to retrieve the stored number.

You’ll notice that calling the set function will require gas (a small amount of Ether) to execute, whereas calling the get function is free as it’s a view function.