getCellValue of ui.spreadsheet, Methods Webix Docs

If the math parameter is true the method will return the math value from the specified cell. If there is no math value or the math parameter is false, the cell value itself will be returned.

// assuming the cell value (A1) is "=5"
$$("ssheet").getCellValue(1,1,false); // "5"
$$("ssheet").getCellValue(1,1); // "=5"
 
// assuming the cell value (A1) is "1"
$$("ssheet").getCellValue(1,1,false); // "1"
$$("ssheet").getCellValue(1,1); // "1"