for (i in 2 : ncol(code)){
        ...
        tempTable <- ...
        sn <- ...
        WriteXLS("tempTable", ExcelFileName = "C:/R_code/../file.xlsx",
              SheetNames = sn);
}

library(xlsx)
write.xlsx(dataframe1, file="filename.xlsx", sheetName="sheet1", row.names=FALSE)
write.xlsx(dataframe2, file="filename.xlsx", sheetName="sheet2", append=TRUE, row.names=FALSE)

wb = createWorkbook()

sheet = createSheet(wb, "Sheet 1")

addDataFrame(dataframe1, sheet=sheet, startColumn=1, row.names=FALSE)
addDataFrame(dataframe2, sheet=sheet, startColumn=10, row.names=FALSE)

sheet = createSheet(wb, "Sheet 2")

addDataFrame(dataframe3, sheet=sheet, startColumn=1, row.names=FALSE)

saveWorkbook(wb, "My_File.xlsx")

require(openxlsx)
list_of_datasets <- list("Name of DataSheet1" = dataframe1, "Name of Datasheet2" = dataframe2)
write.xlsx(list_of_datasets, file = "writeXLSX2.xlsx")

library(writexl)
sheets <- list("sheet1Name" = sheet1, "sheet2Name" = sheet2) #assume sheet1 and sheet2 are data frames
write_xlsx(sheets, "path/to/location")

# Create a blank workbook
OUT <- createWorkbook()

# Add some sheets to the workbook
addWorksheet(OUT, "Sheet 1 Name")
addWorksheet(OUT, "Sheet 2 Name")

# Write the data to the sheets
writeData(OUT, sheet = "Sheet 1 Name", x = dataframe1)
writeData(OUT, sheet = "Sheet 2 Name", x = dataframe2)

# Export the file
saveWorkbook(OUT, "My output file.xlsx")

library(XLConnect)
##
newWB <- loadWorkbook(
  filename="F:/TempDir/tempwb.xlsx",
  create=TRUE)
##
for(i in 1:10){
  wsName <- paste0("newsheet",i)
  createSheet(
    newWB,
    name=wsName)
  ##
  writeWorksheet(
    newWB,
    data=data.frame(
      X=1:10,
      Dataframe=paste0("DF ",i)),
    sheet=wsName,
    header=TRUE,
    rownames=NULL)
}
saveWorkbook(newWB)

install.packages("openxlsx")
 library("openxlsx")

    start.time <- Sys.time()

    # Creating large data frame
    x <- as.data.frame(matrix(1:4000000,200000,20))
    y <- as.data.frame(matrix(1:4000000,200000,20))
    z <- as.data.frame(matrix(1:4000000,200000,20))

    # Creating a workbook
    wb <- createWorkbook("Example.xlsx")
    Sys.setenv("R_ZIPCMD" = "C:/Rtools/bin/zip.exe") ## path to zip.exe

# Adding a worksheets : parameters for addWorksheet are 1. Workbook Name 2. Sheet Name

    addWorksheet(wb, "Sheet 1")
    addWorksheet(wb, "Sheet 2")
    addWorksheet(wb, "Sheet 3")

    # Writing data in to respetive sheets: parameters for writeData are 1. Workbook Name 2. Sheet index/ sheet name 3. dataframe name

    writeData(wb, 1, x)

    # incase you would like to write sheet with filter available for ease of access you can pass the parameter withFilter = TRUE in writeData function.
    writeData(wb, 2, x = y, withFilter = TRUE)

    ## Similarly writeDataTable is another way for representing your data with table formatting:

    writeDataTable(wb, 3, z)

    saveWorkbook(wb, file = "Example.xlsx", overwrite = TRUE)

    end.time <- Sys.time()
    time.taken <- end.time - start.time
    time.taken

library(WriteXLS)
x <- list(sheet_a = data.frame(a=letters), sheet_b = data.frame(b = LETTERS))
WriteXLS(x, "test.xlsx", names(x))

?WriteXLS

`x`: A character vector or factor containing the names of one or
     more R data frames; A character vector or factor containing
     the name of a single list which contains one or more R data
     frames; a single list object of one or more data frames; a
     single data frame object.

mywritexlsx<-function(fname="temp.xlsx",sheetname="Sheet1",data,
                  startCol = 1, startRow = 1, colNames = TRUE, rowNames = FALSE)
{
  if(! file.exists(fname))
    wb = createWorkbook()
  else
   wb <- loadWorkbook(file =fname)
  sheet = addWorksheet(wb, sheetname)

  writeData(wb,sheet,data,startCol = startCol, startRow = startRow,
          colNames = colNames, rowNames = rowNames)
  saveWorkbook(wb, fname,overwrite = TRUE)
}