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Ethereum Projects for Beginners
Ethereum Projects for Beginners

Ethereum Projects for Beginners: Build blockchain-based cryptocurrencies, smart contracts, and DApps

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Ethereum Projects for Beginners

Developing Your First Decentralized Application with Ethereum

DApps or a Decentralized applications is an application that is run on a blockchain. Ethereum provides its users with some flexibility that allows them to create such applications. In this chapter, we will focus on creating a DApp and learn how to implement it in various aspects of our lives.

In this chapter, we will learn how to do the following:

  • Create a project
  • Deploying and testing a project
  • Explore the Solidity syntax and JavaScript codes
  • Bug fixing and debugging smart contracts
  • Changing our application with a better payment method

In order to build an application, we need to understand the codes and syntax that are used to develop it. Hence, we will take a look at the Solidity syntax and also understand the working of the JavaScript codes.

Creating a project

This section will teach us how to create a new project. It will require us to explore the code and the Solidity syntax. Deploying the project will help us understand how easy it is to transform this project into a better payment application. To get a better understanding of the concept, we are going to take a look at some specifics on bug fixing and also learn to debug smart contracts and some function applications.

To begin, we need to create a new folder. For convention's sake, let's name this my_first_project.

The immediate next step would be to run Truffle. The following command is used for this:

C:\WINDOWS\system32>truffle

The output of the command should be as follows:

This displays the list of commands that can be used for various processes for Truffle. The Truffle init command allows us to initialize a new Truffle project.

Throughout the...

Deploying and testing a projects

We will now be deploying the application that we created in the previous section. We will do so by starting a development blockchain, configuring our deployment, deploying our smart contracts, and building the application.

Starting a development blockchain 

Firstly, we are going to want to run our development blockchain. This can be done by typing ganache-cli in the terminal window. Your screen will look as follows:

Make sure you jot down or remember the localhost port number. It is of importance, as you will be connecting to it in the later stages of this project. Ganache-cli generates 10 available accounts and then the corresponding private keys. These private keys are used to encrypt...

Exploring the Solidity syntax and JavaScript codes

This section will help us understand the Solidity syntax. We will explore the Solidity and JavaScript codes to understand our project in depth. This will also give us the power to alter the code to customize it to our needs.

Understanding the Solidity syntax

For understanding the syntax, let's take a look at the Solidity file MetaCoin.sol. The following screenshot will act as a guide so that we understand every line of code:

As you can see, every Solidity file begins with the definition of the Solidity version that you are currently using. In this case, that would be 0.4.17. This is immediately followed by the importing of the conversion library (commonly known as...

Bug fixing and debugging smart contracts

This section tells you how to go about bug fixing and debugging your code. Usually, the code will be debugged in the developer console which is similar to developing regular JavaScript code. If there is an error present in the JavaScript code, you could easily rectify it on the developer console. However, if the bug is in your smart contract, you are going to want to go a bit deeper. How are you going to debug your smart contract once it is live? Well, you cannot—not locally at least. What if somebody finds a bug? You need to find out where it came from. For these very reasons, we can use remix.ethereum.org and etherscan.io.

The modified version of the MetaCoin Solidity file found at remix.ethereum.org is as follows:

You can create this file yourself by clicking the little plus icon in the top-left corner and giving it a name of...

Changing our application with a better payment application

This section will focus on us improving our code. This will include adding functionalities such as depositing ether, gaining tokens, and withdrawing ether in exchange of tokens and also a creator fee.

We will work on the same code that was used for the previous section and continue to build on it.

As we do not want to give away free tokens in exchange for deposited ether, we will eliminate the following line of code completely:

function MetaCoin() public {
balances[tx.origin] = 10000;
}

We begin by setting a creator. To do this, we will need to define an address creator and a creatorFee as follows:

contract MetaCoin {
mapping (address => uint) balances;
address creator;
uint creatorFee = 1;
uint collectedFees = 0;

uint conversionRate = 5;

uint CURRENCY_MULTIPLIER = 10**18;

The collectedFees is what one might...

Summary

In this chapter, we took a look at how to create an Ethereum based application. We also deployed and tested the same projects. We then delved into the Solidity syntax which isn't only vast but is also extensive. JavaScript codes were also looked into. We learned how to fix bugs using our own systems as well as externally. In the end, we finally converted our project into a payment application.

The next chapter focuses on the concepts of creating our own tokens. We will take closer look at ICO's and also at handling our own token transactions. 

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Key benefits

  • •Build your own decentralized applications using real-world blockchain examples
  • •Implement Ethereum for building smart contracts and cryptocurrency applications with easy-to-follow projects
  • •Enhance your application security with blockchain

Description

Ethereum enables the development of efficient, smart contracts that contain code. These smart contracts can interact with other smart contracts to make decisions, store data, and send Ether to others.Ethereum Projects for Beginners provides you with a clear introduction to creating cryptocurrencies, smart contracts, and decentralized applications. As you make your way through the book, you’ll get to grips with detailed step-by-step processes to build advanced Ethereum projects. Each project will teach you enough about Ethereum to be productive right away. You will learn how tokenization works, think in a decentralized way, and build blockchain-based distributed computing systems. Towards the end of the book, you will develop interesting Ethereum projects such as creating wallets and secure data sharing.By the end of this book, you will be able to tackle blockchain challenges by implementing end-to-end projects using the full power of the Ethereum blockchain.

Who is this book for?

This book is for individuals who want to build decentralized applications using blockchain technology and the power of Ethereum from scratch. Some prior knowledge of JavaScript is required, since most examples use a web frontend.

What you will learn

  • •Develop your ideas fast and efficiently using the Ethereum blockchain
  • •Make writing and deploying smart contracts easy and manageable
  • •Work with private data in blockchain applications
  • •Handle large files in blockchain applications
  • •Ensure your decentralized applications are safe
  • •Explore how Ethereum development frameworks work
  • •Create your own cryptocurrency or token on the Ethereum blockchain
  • •Make sure your cryptocurrency is ERC20-compliant to launch an ICO
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Table of Contents

6 Chapters
Workflow Setup and Thinking Blockchain Chevron down icon Chevron up icon
Developing Your First Decentralized Application with Ethereum Chevron down icon Chevron up icon
Creating Your Own Cryptocurrency on the Ethereum Blockchain Chevron down icon Chevron up icon
Signing Legal Documents on Blockchains and Identity Verification Chevron down icon Chevron up icon
Ethereum Outside the PC/Web Environment Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

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