Custom Functions in Excel: Developer Preview

[Olaf Hubel]

Cross posting from our Dev blog:

Custom functions (similar to "user-defined functions", or "UDFs") are JavaScript functions that you can build as part of your add-in. Users can see and run those functions in Excel alongside built-in functions like =SUM or =VLOOKUP. The best part is that those same functions will work everywhere add-ins do: on your PC, Mac, and iPad, and even in Excel Online. But for now the Developer Preview is only available on Windows.

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