Defining Block in Swift

Defining block in Swift. In this video, I will explain and develop the logic behind block class. Let’s switch to our application to continue. Before defining block, we need to break down what a block is. We define earlier that a block consists of three piece of data– the hash, the actual data to be recorded, and previous block’s hash.

Where we want to put our blockchain? We have to know whether the block is the first one or the second one. Well, we can easily define this in Swift. OK, let’s get started to add our properties to the block class.

First one will be hash, which is a string. The second one is data, which is also a string. The third one will be previous block’s hash, which is also string. And we will add index to identify the second block.

And now, an important in code needs to be added. As I mentioned earlier, how every time a block is modified, it has chains. This is one of the big features of block chains which makes it secure. So we have to create a function which can read a hash filled with random letters and numbers.

To create this function, we will need a few lines of code. Function generate, hash, access no parameter, and which will return string. And this is our function. We need to an object which gives us a universally unique value.

In Swift, we can do this by using NSUUID object, which represent the universally unique value. Return will be NSUUID to string. And this value returns with a dash. We needed to remove that from this string, replacing occurrence of.