Get all elements of data from Google Sheets Sheet

getDataElementsFromSheet.js

function getDataElementsFromSheet()
{
  var sheet = SpreadsheetApp.getActiveSheet(); // get active sheet
  var range = sheet.getDataRange(); // get range object containing data
  var data = range.getValues(); // write range data into array called data
  getDataElements(data); // To see the result run function and press <Ctrl + Enter>
}

function getDataElements(data)
{
  var h = data.length; // get number of rows
  var l = data[0].length; // get number of columns
  var row = []; // define empty array to store rows
  
  // loop rows of data
  for (var i = 0; i < h; i++)
  {
    // get single row data inside an array
    row = data[i];
    
    // loop the row
    for (var j = 0; j < l; j++)
    {
      // row[j] -- is a value of a single data element  
      Logger.log(row[j]); // use any operation here.         
    }    
  }
}