function getPlatform() {
  var platformName = 'JavaScript';
  function displayPlatformName() {
    alert(platformName);
  }
  return displayPlatformName;
}

var currentPlatformName = getPlatform();

// This has access to the local variable 'platformName' of exited function getPlatform
// present in the lexical environment when the 'displayPlatformName'is created
currentPlatformName();