Question: How would I implement a Uniform Crossover method in Java for a Genetic Algorithm? 

Currently, I am using 2 ArrayLists which need to be interconnected before the program continues. Below is the start of the method I have been using:

```
private void UniformCrossOver(int ListOne,int ListTwo)
{
...
}

```

Where I stand at the moment, I am assuming that I will need to make another 2 ArrayLists which will have the data split into but I have no idea where to start with the crossover. Would I use a for loop with the size of the new arrays being the defining key?

Your help would be greatly appreciated.

Answer: 
In Xcode 12, you can use Swift Packages with Xcode Playgrounds.

Steps to setup a workspace with a Swift Package and a Playground:

* Open Xcode
* Create a new Workspace (`File > New > Workspace...`)
* Add the desired Swift package via `File > Add Files to "Workspace Name"...` selecting the package directory.
* Create a new Playground via `File > New > Playground...`. Ensure that you select the Workspace we just created as the "Add to" and "Group" option during Playground creation (in the assistant where you select the Playground's location on disk).
* You can now import the Package target into your Playground and starting exploring the Package's functionality.

You can find additional details and a sample project in this WWDC20 session: [Explore Packages and Projects with Xcode Playgrounds](https://developer.apple.com/videos/play/wwdc2020/10096)

Ensure to check the new "Build active scheme" checkbox in the inspector for your existing Playgrounds.
In Xcode 12, playgrounds can work seamlessly with swift packages in a project.

Please follow the steps below:

1. Create a project named `Playground`:

File → New → Project... (⇧⌘N) → Product Name: Playground

⚠️ You can name it whatever you want, here is just an example.
2. Add a swift package for the project, such as `SnapKit`:

File → Swift Packages → Add Package dependency... → <https://github.com/SnapKit/SnapKit.git>
3. Create a playground and add it to the project created in the first step:

File → New → Playground... (⌥⇧⌘N) → Add to: `Playground`
4. Import the swift package (SnapKit) in the Playground:

```
import SnapKit

```

If nothing else, you can use `SnapKit` in the Playground.