CODEGENERATOR

CODEGENERATOR.gs

function CODEGENERATOR() {
  var allCodes = []; // get all of the codes from all of the teacher sheets
  
  var letters = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p'];
  
  var codeLen = 7;
  
  var code = '';
  for(var i = 0; i < codeLen; i++) {
    var randNum = Math.floor(Math.random() * 9);
    var randLetter = Math.floor(Math.random() * letters.length);
    
    var lon = Math.round(Math.random());
    
    if(lon === 0) {
      code += letters[randLetter].toUpperCase();
    } else {
      code += randNum;
    }
  }
  
//  if(allCodes.indexOf(code) === -1) {
//    // it is a unique code
//  }

  return code;
}