text: // how varibale is defined
  let message = 'This is a variable';
  alert(message);
  
  // or you can define multiple
  let age = 24, name = 'John', developer = 'yes/no', salary = 120000.50;
  alert(salary);
  
  // strings
  str = "Hello";
  str1 = 'Single quotes are ok too';
  str2 = `can embed another ${str} and also the total of ${2 + 10}`;
  alert(str2)
  
  // Boolean 'true/false'
  let isGreater = 4 > 2;
  alert(isGreater);