JSFiddle - React, Tailwind, and code Playground

JavaScript

function Array(){
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var s3 = ss.getSheetByName("List3");
  var s2 = ss.getSheetByName("Poizkus")
  var range = s3.getRange("a1:A10");
  var rangeB = s2.getRange("a1:a10");
  
  //definiraš kaj naj ti najde
  var FindBlock = "BLOCK"
  
  //Definiraš range kje naj išče in zapiše v logger
  var data = s2.getDataRange().getValues();
  for (var i = 0; i <data.length; i++) {
    if(data [i][0]==FindBlock){
  }
   Logger.log(data[i][0]);
}