Google App Script function looking for a list of values from a sheet column in another sheet column and deleting the corresponding lines.

delete-vals.gs

function checker () {
 // Delete all the row associated to a list of values contained in an other sheet  
 var sss = SpreadsheetApp.openById('X'); // Replace X with spreadsheet ID
 var ts = sss.getSheetByName('sheet1'); // Replace sheet1 with destination Sheet tab name
 var ss = sss.getSheetByName('sheet2'); // Replace sheet2 with source Sheet tab name
 
 var startRowTS = 1;  // First row of data to process in Sheet1
 var startRowSS = 1;  // First row of data to process in Sheet2
 
 var numRowsTS = ts.getLastRow() ;   // Number of rows to process  destination table
 var numRowsSS = ss.getLastRow();   // Number of rows to process  source table
  
 var range1 = ss.getRange(1, 1, numRowsSS, 10); // Assign the range you want to copy
 var range2 = ts.getRange(1, 1, numRowsTS, 10); // Assign the range you want to copy
 var data1 = range1.getValues();
 var data2 = range2.getValues();
  
 var cell;
 var rowsDeleted = 0; // variable to compensate offset caused by row deletion
  
 for (var i = startRowSS; i <= numRowsSS; ++i) {
  // Bellow replace y by the column number (+1) where you get value, z where you look for it 
  var pos = rowOf(data1[i][y], z, data2); 
 
  if (pos != 0)
    { 
      Logger.log( "Row "+ pos+ " is deleted!") 
      ts.deleteRow( pos - rowsDeleted);
      rowsDeleted++;
	  
	  // Alternative to just color the cell in red instead of row
	  // Logger.log( "The cell containing "+data1[i][y]+" on row "+pos+" is red!") 
      // cell = range2.getCell(pos, z);
      // cell.setBackground('red');
    }
     
 }
  
}


function rowOf(containingValue, columnToLookInIndex, data) {
  // This function looks for a value in a column and return its position at first appearance
  var outRow = 0;
  
  for (var i = 0; i < data.length; i++)
  {
    if (data[i][columnToLookInIndex] == containingValue)
    {
      outRow = i+1;
      break;
    }
  }
  
  return outRow;
}