Building the getLastBlock method

Now, the next method that we are going to add to our Blockchain constructor function will be the getLastBlock. This method will simply return the last block in our blockchain to us. Follow the below mentioned steps to build the method: 

1. Go to our dev/blockchain.js file, and after our createNewBlock method, add the following:

Blockchain.prototype.getLastBlock = function () { 

}

1. Inside of this getLastBlock method, we will type the following highlighted line of code:

Blockchain.prototype.getLastBlock = function () { 
    return this.chain[this.chain.length - 1];

}

The [this.chain.length - 1]; in this preceding code defines the position of the block in the chain, which, in our case, is the previous block, therefore negated by 1. This method is simple and straightforward, and we'll use it in later chapters.