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Smart Contracts Programming Tutorials, Guides & Best Practices

Explore 7+ expertly crafted smart contracts tutorials, components, and code examples. Stay productive and build faster with proven implementation strategies and design patterns from DeveloperBreeze.

Writing an ERC-20 Token Contract with OpenZeppelin

Tutorial August 22, 2024
solidity

  • Open a terminal and create a new directory for your project:
     mkdir my-token
     cd my-token

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Understanding Gas and Optimization in Smart Contracts

Tutorial August 22, 2024
solidity

  • Arithmetic Operations: Adding, subtracting, or multiplying integers consumes minimal gas (e.g., 3-5 gas units).
  • Storage Operations: Writing data to the blockchain (e.g., updating a state variable) is expensive (e.g., 20,000 gas units).
  • Function Calls: Calling a function, especially one that interacts with another contract, can significantly increase gas consumption.

Optimizing gas consumption in smart contracts can lead to substantial cost savings, especially for frequently executed contracts. Here are some strategies to consider:

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Building a Decentralized Application (DApp) with Smart Contracts

Tutorial August 22, 2024
solidity 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Message DApp</title>
</head>
<body>
    <h1>Decentralized Message Store</h1>
    <input type="text" id="messageInput" placeholder="Enter a new message">
    <button onclick="setMessage()">Set Message</button>
    <p id="currentMessage">Loading message...</p>

    <script src="https://cdn.jsdelivr.net/npm/web3@latest/dist/web3.min.js"></script>
    <script>
        const contractAddress = 'YOUR_CONTRACT_ADDRESS';
        const abi = [/* ABI from compiled contract */];

        const web3 = new Web3(Web3.givenProvider);
        const contract = new web3.eth.Contract(abi, contractAddress);

        async function setMessage() {
            const accounts = await web3.eth.getAccounts();
            const message = document.getElementById('messageInput').value;
            await contract.methods.setMessage(message).send({ from: accounts[0] });
            loadMessage();
        }

        async function loadMessage() {
            const message = await contract.methods.getMessage().call();
            document.getElementById('currentMessage').innerText = message;
        }

        window.onload = loadMessage;
    </script>
</body>
</html>
  • 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.

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Introduction to Smart Contracts on Ethereum

Tutorial August 22, 2024
solidity

  • pragma solidity ^0.8.0;: Specifies the version of Solidity.
  • contract SimpleStorage: Defines a new smart contract named SimpleStorage.
  • uint256 public storedData: Declares a public variable to store an unsigned integer.
  • function set(uint256 x) public: A function to set the value of storedData.
  • function get() public view returns (uint256): A function to retrieve the value of storedData.

After writing the smart contract, the next step is to deploy it on a test network to see it in action.

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