List the sheets of an Excel file

Before you can start importing from Excel, you should find out which sheets are available in the workbook. You can use the excel_sheets() function for this.

You will find the Excel file urbanpop.xlsx in your working directory (type dir() to see it). This dataset contains urban population metrics for practically all countries in the world throughout time (Source: Gapminder). It contains three sheets for three different time periods. In each sheet, the first row contains the column names.