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This data structure would be suitable for representing arithmetic expressions of the forms var, expr + expr, and bind var = expr in expr. 9 and 11 are dedicated to techniques for representing and processing languages of this kind. As with all tree structures, most traversal algorithms over this type of abstract syntax trees will not naturally be tail recursive. For example, here is a simple evaluator: type env = Map<string,int> let rec eval (env: env) expr = match expr with | Add(e1,e2) -> eval env e1 + eval env e2 | Bind(var,rhs,body) -> eval (env.Add(var, eval env rhs)) body | Var(var) -> env.[var] | Num(n) -> n The recursive call eval env rhs is not tail recursive. For the vast majority of applications, you will never need to worry about making this algorithm tail recursive! However, stack overflow may be a problem if bindings are nested to very high depth, such as in bind v1 = (bind v2 = . . . (bind v1000000 = 1. . .)) in v1+v1. If the syntax trees come from human-written programs, you can safely assume this won t be the case. However, if you ever did need to make the implementation tail recursive, you could use continuations, as shown in Listing 8-12. Listing 8-12. A Tail-Recursive Expression Evaluator Using Continuations let rec evalCont (env: env) expr cont = match expr with | Add(e1,e2) -> evalCont env e1 (fun v1 -> evalCont env e2 (fun v2 -> cont (v1+v2))) | Bind(var,rhs,body) -> evalCont env rhs (fun v1 -> evalCont (env.Add(var,v1)) body cont)

When an object is new, it means that the object exists in memory, but not in the database or other persistent store If the object s data resides in the database, then the object is considered to be old I typically think of it this way: if the primary key value in the object corresponds to an existing primary key value in the database, then the object is old; otherwise it is new The value behind the IsNew property is stored in an _isNew field.

| Num(n) cont(n) | Var(var) cont(env.[var])

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var description = document.getElementById("description"); description.firstChild.nodeValue = text; } By enclosing the description portion in an if statement, I ve made the description element optional. If it exists, it will be updated but otherwise it will be ignored. As the last step in the function, we'll return true to report that the function executed successfully: return true; This is how the updated function looks with the checks built in: function showPic(whichpic) { if (!document.getElementById("placeholder")) return false; var source = whichpic.getAttribute("href"); var placeholder = document.getElementById("placeholder"); placeholder.setAttribute("src",source); if (document.getElementById("description")) { var text = whichpic.getAttribute("title"); var description = document.getElementById("description"); description.firstChild.nodeValue = text; } return true; } That s better. The script no longer assumes the existence of elements in the markup. If, for some reason, the placeholder image isn t in the document, there won t be any JavaScript errors. But there s a problem. Remove the placeholder image from the markup and refresh the page in a browser. Click on any link in the imagegallery list. You ll see that nothing happens. This means that the script isn t degrading gracefully. In this situation, it would be better to follow the link in the browser than have nothing happen at all. The problem lies with the prepareGallery function. It makes the assumption that the showPic function will work fine, and it cancels the default action by always returning false: links[i].onclick = function() { showPic(this); return false; } The decision to return a value of false (thereby canceling the default action of following the link in the browser) should really be determined by the result of the showPic function. The showPic function returns two possible values: If the image is successfully swapped out, showPic will return true. If the function is unsuccessful, showPic will return false.

When an object is first created, this value defaults to the object being new: private bool _isNew = true; If the object is then loaded with data from the database, the _isNew field is set to false, through a protected MarkOld() method: protected virtual void MarkOld() { _isNew = false; MarkClean(); } Notice that this process also sets the object to a clean status a concept discussed later for the IsDirty property When an object s data has just been loaded from the database, it is safe to assume that the object s data matches the data in the database and so has not been changed and thus is clean.

let eval env expr = evalCont env expr (fun x -> x)

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