Book Image

Mastering Blockchain Programming with Solidity

By : Jitendra Chittoda
Book Image

Mastering Blockchain Programming with Solidity

By: Jitendra Chittoda

Overview of this book

Solidity is among the most popular and contract-oriented programming languages used for writing decentralized applications (DApps) on Ethereum blockchain. If you’re looking to perfect your skills in writing professional-grade smart contracts using Solidity, this book can help. You will get started with a detailed introduction to blockchain, smart contracts, and Ethereum, while also gaining useful insights into the Solidity programming language. A dedicated section will then take you through the different Ethereum Request for Comments (ERC) standards, including ERC-20, ERC-223, and ERC-721, and demonstrate how you can choose among these standards while writing smart contracts. As you approach later chapters, you will cover the different smart contracts available for use in libraries such as OpenZeppelin. You’ll also learn to use different open source tools to test, review and improve the quality of your code and make it production-ready. Toward the end of this book, you’ll get to grips with techniques such as adding security to smart contracts, and gain insights into various security considerations. By the end of this book, you will have the skills you need to write secure, production-ready smart contracts in Solidity from scratch for decentralized applications on Ethereum blockchain.
Table of Contents (21 chapters)
Free Chapter
1
Section 1: Getting Started with Blockchain, Ethereum, and Solidity
5
Section 2: Deep Dive into Development Tools
9
Section 3: Mastering ERC Standards and Libraries
16
Section 4: Design Patterns and Best Practices

Using emit and events for event logging

Events in Solidity are used to log information. Off-chain client applications can subscribe and listen for any events that are being emitted in the blockchain. These client applications use the Remote Procedure Call (RPC) interface to interact with the Ethereum nodes and are notified upon event emission. 

By using the Solidity language, your contracts can emit events, but they cannot listen to or read the data of a triggered event. Events are always inherited from contracts, which means that you can emit events that are defined in your contract inheritance tree.

When you emit an event, its arguments are stored in the transaction log. These logs are related to the contract address and are stored in the blockchain's block. These events will be available forever since they are present in the block. However, this might change...