text: // Closures
  function makeMultiplier (multiplier) {
    // var multiplier = 2;
    function b() {
      console.log("Multiplier is: " + multiplier);
    }
    b();
    
  
    var multiply = function (x) {
      return multiplier * x;
    }
  
    return multiply;
  }
  
  var doubleAll = makeMultiplier(2);
  console.log(doubleAll(10)); // its own exec env