need little introduction; for an end user, these work in jQuery grid similar to how they work in Excel spreadsheet.
Excel formulas can be pre defined in JSON data with
pq_fn property of rows ( as shown in this example ).
Excel formulas can be nested upto any number of levels e.g.,
Excel formulas can also be entered by user typing in cells ( first character as "=" ) similar to Excel.
Excel formulas can contain absolute and relative references to range of cells.
Excel formulas can be imported from and exported to Excel xlsx file.
Result of excel formulas can also be exported to other formats like csv, html.
Here is a list of supported Excel formulas by grid.