javascript - Changing script to send non-duplicate values to a new sheet instead of duplicate values -


i have script iterates through 2 spreadsheets, finds duplicate values in column a, appends row of these duplicate values sheet.

i want script similar thing, append rows not duplicates instead of ones are. how can alter sends non duplicates "new students" sheet"? tried changing == !==. sends whole list. have been searching around while , know it's easy fix.
much! brandon

function compareandupdate() {    var s1 = spreadsheetapp.openbyid("xxxxxx-vvxyewdki0j9tgqjl9_f-wze0zoboqrisclaa").getsheetbyname('updated student list');   var s2 = spreadsheetapp.openbyid("xxxxxx-yb9xm1j5rkws7nf23vd-ntueigspbctj3lew4").getsheetbyname('master student list');   var s3 = spreadsheetapp.openbyid("xxxxxx-yb9xm1j5rkws7nf23vd-ntueigspbctj3lew4").getsheetbyname('new students');    var values1 = s1.getdatarange().getvalues();   var values2 = s2.getdatarange().getvalues();   var resultarray = [];  for(var n=0; n < values1.length ; n++){     var keep = false;     for(var p=0; p < values2.length ; p++){       logger.log(values1[n][0]+' =? '+values2[p][0]);       if( values1[n][0] == values2[p][0]){         resultarray.push(values1[n]);         logger.log('true');         break ;// remove if values not unique , want keep occurrences...       }     }   }     s3.getrange(+1,1,resultarray.length,resultarray[0].length).setvalues(resultarray); }

if prefer keep existing structure (which think wrote time ago ;-) , btw has unnecessary variable (keep)!) can use modified version of code :

function compareandupdate() {    var s1 = spreadsheetapp.openbyid("xxxxxx-vvxyewdki0j9tgqjl9_f-wze0zoboqrisclaa").getsheetbyname('updated student list');   var s2 = spreadsheetapp.openbyid("xxxxxx-yb9xm1j5rkws7nf23vd-ntueigspbctj3lew4").getsheetbyname('master student list');   var s3 = spreadsheetapp.openbyid("xxxxxx-yb9xm1j5rkws7nf23vd-ntueigspbctj3lew4").getsheetbyname('new students');  //  var definition easier testing purpose   //  var s1 = spreadsheetapp.getactivespreadsheet().getsheets()[0]; //  var s2 = spreadsheetapp.getactivespreadsheet().getsheets()[1]; //  var s3 = spreadsheetapp.getactivespreadsheet().getsheets()[2];    var values1 = s1.getdatarange().getvalues();   var values2 = s2.getdatarange().getvalues();   var resultarray = [];    for(var n=0; n < values1.length ; n++){     var keep = true;     for(var p=0; p < values2.length ; p++){       logger.log(values1[n][0]+' =? '+values2[p][0]);       if( values1[n][0] == values2[p][0]){         keep = false;// if same value in first column in s2 don't keep (you can modify condition needs, extend whole row or other columns example )         break;       }     }     if(keep){       resultarray.push(values1[n]);// keep values s1 not in s2     }     }   s3.getrange(+1,1,resultarray.length,resultarray[0].length).setvalues(resultarray); }

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