text: // external js file
  // Write all JavaScript code here
  
  // traditional var syntax
  var PI1 = 3.14;
  console.log(PI1); // 3.14
  
  PI1 = 100;
  console.log(PI1); // 100
  
  // ------------------------------
  
  // ES6 syntax
  const PI2 = 6.28;
  console.log("ES6 syntax const: " + PI2); // 6.28
  
  PI2 = 100; // error
  