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Truffle Quick Start Guide
Truffle Quick Start Guide

Truffle Quick Start Guide: Learn the fundamentals of Ethereum development

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Truffle Quick Start Guide

Web3 and Solidity in Truffle

This chapter will introduce you to web3, and its related APIs and uses in Truffle. You will gain an understanding of the fundamentals of web3 and how it is used in Truffle to connect to and help develop blockchain and/or smart contract-based applications. Moreover, this chapter will give you a brief refresher about Solidity, including functions, data types, visibility specifiers, and events.

Specifically, you will:

  • Learn and understand the reasons for the use of web3 in an isolated environment in Truffle
  • Learn and understand the reasons for the use of web3 in Truffle
  • Learn and understand the use of various types of functions and data types in Solidity
  • Learn and understand when and why events are used
  • Learn and understand how to use the appropriate type and visibility specifier when defining a function
...

Technical requirements

What is web3?

We mentioned web3 briefly in Chapter 1, Truffle for Decentralized Applications, and we even used it without fully understanding it. The purpose of Chapter 1, Truffle for Decentralized Applications, was to get a fully functional and working Dapp on a local blockchain so you could understand the power of Truffle.

Now, it's time to get more granular.

Web3 is a collection of APIs that allows JavaScript to access blockchain-based data and perform common Ethereum functions such as getting all accounts in a particular network, getting the balance of an account, or getting the particular block number.

Let's take a look at some examples:

var balance = web3.eth.getBalance("0x407d73d8a49eeb85d32cf465507dd71d507100c1");
console.log(balance); // instanceof BigNumber
console.log(balance.toString(10)); // '1000000000000'
console.log(balance.toNumber...

Web3 in Truffle

Now that we have a clear understanding of web3 in an isolated environment, it's time to get out of our comfort zone and see how it interacts with Truffle. We've already seen a bit of this in Chapter 1, Truffle for Decentralized Applications.



Let's refer back to our app.js file under chapter1/app/javascripts/ (https://github.com/PacktPublishing/Truffle-Quick-Start-Guide/blob/master/chapter1/app/javascripts/app.js).

Let's see how we import web3:

import { default as Web3} from 'web3';

Now, let's see how we set the blockchain network provider for web3:

window.web3 = new Web3(new Web3.providers.HttpProvider("http://127.0.0.1:9545"));

Remember how we simply glossed over this in Chapter 1, Truffle for Decentralized Applications? Hopefully, you now have a better understanding of what's going on here. Since we don&apos...

Solidity – a refresher

This is by no means a comprehensive tutorial on Solidity. This section will give you enough knowledge to build a fully functional Truffle Dapp. For more information on Solidity, the documentation is very handy; check it out here: https://solidity.readthedocs.io/en/v0.4.21/.

If you already have a good grasp of Solidity, you can skip the rest of this chapter and move on to Chapter 3, Choosing an Ethereum Client for Your Dapp.

In this section, we will cover Solidity basics. Further, you will find subsections for important components of Solidity. Let's start with our first component—data types.

Data types

Solidity, just like any other language, has some data types. Of them, let's...

Summary

Great job. We've covered a lot in this chapter.

Just as we did with web3, the best way to learn or catch up on Solidity is to play with it inside of an isolated environment. I've created a file for you called solidity-playground.sol. You can find it here: https://github.com/PacktPublishing/Truffle-Quick-Start-Guide/blob/master/chapter2/solidity-playground.sol. This contains the same SimpleTransfer contract. It's for you to play with, add/alter functions, and so on—it's all yours. You can use an online Solidity IDE called Remix (https://remix.ethereum.org) to run your contract.

See you in Chapter 3, Choosing an Ethereum Client for Your Dapp, where you will learn how to interact with various Ethereum clients and choose the correct one for your Dapp.

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Key benefits

  • Build your first Ethereum Dapp with Truffle: the most popular Ethereum development framework
  • Build, compile, and deploy smart contracts in your development environment
  • Embrace Blockchains and utilize it to create new generation of secured and scalable apps

Description

Truffle is a world-class development environment, testing framework and asset pipeline for Ethereum, aiming to make life as an Ethereum developer easier. If you are a web developer wanting to try your hand at developing Dapps with Truffle, then this is the book for you. This book will teach you to write smart contracts and build Dapps with Truffle. You will begin with covering the basics of Truffle, briefly explaining how it integrates Solidity and Web3, in orderto start building a mini decentralized application. Also, you will dive into migration, testing and integrating Truffle with the use of popular JavaScript frameworks. Lastly, you will ship your decentralized application and package it into a product. Moreover, you will go through the best practices in Truffle,so as to increase your proficiency in building Dapps with Truffle. By the end of the book, you will be able to write smart contracts and build decentralized applications with Truffle on Ethereum blockchains.

Who is this book for?

This book is for web developers who are interested in the new world blockchain. Some basic understanding of JavaScript and web services is required. No prior knowledge of Decentralized applications or blockchain is required.

What you will learn

  • Understand the fundamentals of Truffle and Web3
  • Build a decentralized application with Truffle, while choosing the correct Ethereum client
  • Connect your Dapp to Ethereum clients including Geth, Parity, and Ganache
  • Migrate and test your Dapp with the correct networks such as Ropsten and Rinkeby
  • Package a decentralized application into a user-friendly product by integrating Truffle with JavaScript frameworks such as Angular, React and Vue
  • Explore tools including Ethereum Package Manager, the Registrar and browser wallets, and exploit third-party smart contract libraries.
  • Evaluate the common migration pitfalls and how to mitigate them

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Publication date : Jun 27, 2018
Length: 170 pages
Edition : 1st
Language : English
ISBN-13 : 9781789132540
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Product Details

Publication date : Jun 27, 2018
Length: 170 pages
Edition : 1st
Language : English
ISBN-13 : 9781789132540
Category :
Languages :
Concepts :
Tools :

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Table of Contents

8 Chapters
Truffle for Decentralized Applications Chevron down icon Chevron up icon
Web3 and Solidity in Truffle Chevron down icon Chevron up icon
Choosing an Ethereum Client for Your Dapp Chevron down icon Chevron up icon
Migrating Your Dapp to Ethereum Blockchains Chevron down icon Chevron up icon
Truffle and Popular JavaScript Technologies Chevron down icon Chevron up icon
Testing Your Dapp Chevron down icon Chevron up icon
Truffle Gotchas and Best Practices Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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Ali Jul 15, 2018
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I am a review of this book. This book is easy to understand and each topic is expalined in depth with examples.It will give you good start in testing and deployment of dapp on mainnet or testnets.
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