Instruction: Describe how to write and implement a user-defined function in Excel using VBA.
Context: This question tests the candidate's skills in extending Excel's functionality through custom scripting with VBA, allowing for tailored solutions to complex problems.
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First, to access the VBA editor in Excel, you press Alt + F11. This shortcut opens the VBA Editor interface. Once you're in the VBA editor, you'll need to insert a new module where your custom function code will reside. You can do this by right-clicking on any of the objects in the Project Explorer window, typically found on the left-hand side of the editor. Choose Insert > Module from the context menu. This action creates a new module, a blank canvas where you can write your code.
Writing the function starts with defining it using the Function keyword, followed by the name of your function. The name should be descriptive of what your function does, adhering to the camelCase naming convention is a good practice. After the name, you include...