In Sugoi, you can “throw” actions. It could look weird but it's an good choice, because throwing exceptions actually stops the code execution and usually exits the program.

In the context of a web application, you often want to trigger an error message or a redirection and stop the current action.

//Example : Redirect the user to another page if he's not logged
function doDashboard(){
  if(app.user==null){
     throw Redirect("/user/login");
  }
}

Throwing an Error will display a clean message on the top of the page

//Example : throw an error message if the password does not match
function doLogin(){
 
  var u = db.User.manager.select($password == app.params.get("password"));
  if(u==null){
     throw Error("/login","This password does not match with any of our users");
  }
}

Same concept, with a confirmation message :

function doRecord(product:db.Product,quantity:Int){
 
  var order = Order.recordOrder(product, quantity, app.user);
 
  if(order!=null){
     throw Ok("/home","You order has been recorded.");
  }else{
     throw Error("/record","Warning, an error occured while processing your order");
  }
}