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Learn Blockchain Programming with JavaScript

You're reading from   Learn Blockchain Programming with JavaScript Build your very own Blockchain and decentralized network with JavaScript and Node.js

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Product type Paperback
Published in Nov 2018
Publisher Packt
ISBN-13 9781789618822
Length 252 pages
Edition 1st Edition
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Author (1):
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Eric Traub Eric Traub
Author Profile Icon Eric Traub
Eric Traub
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Table of Contents (10) Chapters Close

Preface 1. Setting up the Project 2. Building a Blockchain FREE CHAPTER 3. Accessing the Blockchain through an API 4. Creating a Decentralized Blockchain Network 5. Synchronizing the Network 6. Consensus Algorithms 7. Block Explorer 8. In conclusion... 9. Other Books You May Enjoy

Building the getBlock method

Let's build a new method called getBlock that will take the given blockHash and search the entire blockchain for the block associated with that particular hash. In order to build the getBlock method, follow these steps:

  1. Go to the dev/blockchain.js file and after the chainIsValid method, define this new method as follows:
Blockchain.prototype.getBlock = function(blockHash) { 

};

  1. Inside this method, we want to iterate through the entire blockchain and search for the block that has a particular blockHash value. Then, this method will return that specific block to us. We're going to do all this with the help of a for loop:
Blockchain.prototype.getBlock = function(blockHash) { 
this.chain.forEach(block => {

});
};

When defining the for loop, we cycle through every single block in the blockchain.

  1. Next, inside the loop, mention...
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