Function expressions

greeting.js

var greeting;
newCustomer = true;//change to false or true for diff result.

if(newCustomer){
  greeting = function() {
    alert("Thanks for visiting our site!\n" + "Discover our content!");
  };
} else {
  greeting = function() {
    alert("Welcome back!\n" + "We have new content for you!");
  };
}
terminal(greeting);
function terminal(message) {
  message();
}