This post has been republished via RSS; it originally appeared at: Excel Blog articles.
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.
