modifying arrays in nodes in the scenetree from editorplugin

## Modifying Arrays in Nodes in the SceneTree from an EditorPlugin in Godot

This tutorial will guide you through the process of creating an EditorPlugin in Godot that allows you to modify arrays residing in nodes directly from the editor. This can be incredibly useful for tasks like:

* **Level Design:** Quickly adding/removing items from a list of potential spawn locations.
* **Data Management:** Modifying lists of textures, materials, or other resources associated with a node.
* **Custom Behaviors:** Adjusting parameters in lists that control the behavior of custom scripts.

We'll cover the following topics:

1. **Setting up the EditorPlugin:** Creating the basic plugin structure and adding it to the editor.
2. **Accessing Nodes in the SceneTree:** Getting a reference to the currently selected node.
3. **Inspecting and Identifying Arrays:** Determining if a node has a property that is an array and identifying its type.
4. **Creating a Custom Editor Panel:** Building a user interface within the editor to interact with the array. This will include:
* Displaying the array's contents.
* Adding new elements.
* Removing existing elements.
* Modifying existing elements.
5. **Applying Changes to the Node's Property:** Writing the modified array back to the node.
6. **Handling Different Array Types:** Dealing with arrays of different data types (integers, strings, resources, etc.).
7. **Keeping the UI Updated:** Ensuring the editor panel reflects changes made to the array from other sources (e.g., scripts, other plugins).
8. **Complete Code Example:** A fully functional example you can copy and paste.
9. **Important Considerations & Best Practices:** Performance, error handling, undo/redo, etc.

**Let's get started!**

**1. Setting up the EditorPlugin**

First, create a new Godot project or open an existing one.

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