strategies and if statements

strategies_and_if.js

var greeters = [
  new Greeter(new BoredGreetingStrategy()),
  new Greeter(new PoliteGreetingStrategy()),
  new Greeter(new FriendlyGreetingStrategy()),
];

greeters.forEach(function(greeter) {
  
  // Since each greeter knows its strategy, there's no need
  // to do any type checking. We just greet, and the object
  // knows how to handle it.
  greeter.greet();
});