How to calculate the IFNA function using the Aspose.Cells library For JavaScript via C++. Load an existing Excel file or create a new one, calculate the IFNA function to get the result, and finally save the modified Excel file to disk....How to calculate the IFNA function using the Aspose.Cells library for JavaScript via C++. Load an existing Excel file or create a new one, calculate the IFNA function to get the result, and finally save the modified Excel file to disk.