Delegates and Extensions in Unity - ExtensionExample.cs

ExtensionExample.cs

// Defines an add method that is chainable (returns itself)
public static List<T> ChainableAdd<T>(this List<T> list, T item)
{
    list.Add(item);
    return list;
}

// Usage
List<int> numbers = new List<int>();
numbers.ChainableAdd(1).ChainableAdd(2).ChainableAdd(3); // numbers will now contain [1, 2, 3]