| %||% | If NULL then ... | 
| activeSheet | Get/set active sheet of the workbook | 
| activeSheet<- | Get/set active sheet of the workbook | 
| addCreator | Add another author to the meta data of the file. | 
| addFilter | Add column filters | 
| addStyle | Add a style to a set of cells | 
| addWorksheet | Add a worksheet to a workbook | 
| all.equal | Check equality of workbooks | 
| all.equal.Workbook | Check equality of workbooks | 
| buildWorkbook | Build Workbook | 
| cloneWorksheet | Clone a worksheet to a workbook | 
| conditionalFormat | Add conditional formatting to cells | 
| conditionalFormatting | Add conditional formatting to cells | 
| convertFromExcelRef | Convert excel column name to integer index | 
| convertToDate | Convert from excel date number to R Date type | 
| convertToDateTime | Convert from excel time number to R POSIXct type. | 
| copyWorkbook | Copy a Workbook object. | 
| createComment | create a Comment object | 
| createNamedRegion | Create a named region. | 
| createStyle | Create a cell style | 
| createWorkbook | Create a new Workbook object | 
| databar | Add conditional formatting to cells | 
| dataValidation | Add data validation to cells | 
| deleteData | Delete cell data | 
| freezePane | Freeze a worksheet pane | 
| getBaseFont | Return the workbook default font | 
| getCellRefs | Return excel cell coordinates from (x,y) coordinates | 
| getCreators | Add another author to the meta data of the file. | 
| getDateOrigin | Get the date origin an xlsx file is using | 
| getNamedRegions | Get named regions | 
| getSheetNames | Get names of worksheets | 
| getStyles | Returns a list of all styles in the workbook | 
| getTables | List Excel tables in a workbook | 
| groupColumns | Group columns | 
| groupRows | Group Rows | 
| if_null_then | If NULL then ... | 
| insertImage | Insert an image into a worksheet | 
| insertPlot | Insert the current plot into a worksheet | 
| int2col | Convert integer to Excel column | 
| loadWorkbook | Load an existing .xlsx file | 
| makeHyperlinkString | create Excel hyperlink string | 
| mergeCells | Merge cells within a worksheet | 
| modifyBaseFont | Modify the default font | 
| names | get or set worksheet names | 
| names.Workbook | get or set worksheet names | 
| names<-.Workbook | get or set worksheet names | 
| op.openxlsx | openxlsx Options | 
| openXL | Open a Microsoft Excel file (xls/xlsx) or an openxlsx Workbook | 
| openxlsx | xlsx reading, writing and editing. | 
| openxlsxFontSizeLookupTable | Font Size Lookup tables | 
| openxlsxFontSizeLookupTableBold | Font Size Lookup tables | 
| openxlsx_getOp | openxlsx Options | 
| openxlsx_options | openxlsx Options | 
| openxlsx_setOp | openxlsx Options | 
| pageBreak | add a page break to a worksheet | 
| pageSetup | Set page margins, orientation and print scaling | 
| protectWorkbook | Protect a workbook from modifications | 
| protectWorksheet | Protect a worksheet from modifications | 
| read.xlsx | Read from an Excel file or Workbook object | 
| readWorkbook | Read from an Excel file or Workbook object | 
| removeCellMerge | Create a new Workbook object | 
| removeColWidths | Remove column widths from a worksheet | 
| removeComment | Remove a comment from a cell | 
| removeFilter | Remove a worksheet filter | 
| removeRowHeights | Remove custom row heights from a worksheet | 
| removeTable | Remove an Excel table in a workbook | 
| removeWorksheet | Remove a worksheet from a workbook | 
| renameWorksheet | Rename a worksheet | 
| replaceStyle | Replace an existing cell style | 
| saveWorkbook | save Workbook to file | 
| setColWidths | Set worksheet column widths | 
| setFooter | Set footer for all worksheets | 
| setHeader | Set header for all worksheets | 
| setHeaderFooter | Set document headers and footers | 
| setLastModifiedBy | Add another author to the meta data of the file. | 
| setRowHeights | Set worksheet row heights | 
| sheets | Returns names of worksheets. | 
| sheetVisibility | Get/set worksheet visible state | 
| sheetVisibility<- | Get/set worksheet visible state | 
| sheetVisible | Get worksheet visible state. | 
| sheetVisible<- | Get worksheet visible state. | 
| showGridLines | Set worksheet gridlines to show or hide. | 
| ungroupColumns | Ungroup Columns | 
| ungroupRows | Ungroup Rows | 
| worksheetOrder | Order of worksheets in xlsx file | 
| worksheetOrder<- | Order of worksheets in xlsx file | 
| write.xlsx | write data to an xlsx file | 
| writeComment | write a cell comment | 
| writeData | Write an object to a worksheet | 
| writeDataTable | Write to a worksheet as an Excel table | 
| writeFormula | Write a character vector as an Excel Formula |