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OCaml is a constant language, which means that variables are really just named values that cannot change within a scope during runtime. Although it might sound like hedging, it means that you do not have to worry about a value getting stepped on in OCaml. You know that after a value is set, it cannot change in the scope you are in so you do not have to check it. When combined with automatic garbage collection, this constancy protects you from a raft of problems that can occur in other programming languages. For example, in many languages, a function might modify data when you call it, resulting in side effects. In OCaml, a function is prevented from modifying those data structures by the language itself. OCaml does have mutable references, which are more like very safe pointers than variables. They do not have the same problems that pointers in other languages have, however. You cannot, for example, perform operations on the pointer other than setting and retrieving data.

Next, you loop through your results and convert them into an array of data suitable for graphing:

There are some variables that are mutable, which are called references or mutable values. They are not considered a pure functional construct; they exist because OCaml is a practical language, and there are times when having mutability (with a buffer, for example) can be very handy.

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{ xmlhttp = false; } } if(!xmlhttp && typeof XmlHttpRequest!= 'undefined') { // We must be using a Mozilla-based browser // so create a native request object now xmlhttp = new XmlHttpRequest(); } } function trimString (str) { str = this != window this : str; return str.replace(/^\s+/g, '').replace(/\s+$/g, ''); } function callback() { if(xmlhttp.readyState == 4) { if(xmlhttp.status == 200) { var xmlresponse = xmlhttp.responseXML.documentElement; var textresponse = xmlhttp.responseText; var finddiv = document.getElementById("divResponse"); finddiv.innerText = textresponse; alert(trimString(xmlresponse.getElementsByTagName ("message")[0].firstChild .data)); } } } function btnClick() { xmlhttp.open("GET", "XMLFile.xml", true); xmlhttp.onreadystatechange = callback; xmlhttp.send(null); } </script>

weeks = [] max_gross=0.0 PaypalTransaction.find_by_sql(sql).each do |week| max_gross = week.weekday_amount.to_f if week.weekday_amount.to_f > max_gross max_gross = week.weekend_amount.to_f if week.weekend_amount.to_f > max_gross weeks << { :week_number=>week.week_number.to_i, :year=>week.year.to_i, :weekday_amount=>week.weekday_amount.to_f, :weekend_amount=>week.weekend_amount.to_f } end

s Note OCaml is not a purely functional language; it is a practical language. So if you are set on being

<body> <form id="form1" runat="server"> <input id="btnGetXML" type="button" value="Get XML" onclick="btnClick();" /> <div id="divResponse"></div> </form> </body> </html> We now have all of the structure in place. Your site should look similar to Figure 3-9.

This loop handles two issues: first, you can track the highest value, which will be used to scale your graph. Next, an element is appended to the weeks array, which contains your data cast to an appropriate type: integer or float. (Without this cast, the variables would be returned as strings.) This array will be used next to produce an HTML page with a list of weeks and a graph.

If you have ever used a functional programming (FP) language, you know about the let binding It means in OCaml what it means in English: let (allow) this name to be associated with this value The simplest let binding binds a basic type to a name: # let a = 1;; val a : int = 1 Note the new kind of return message: val This is a message from the OCaml compiler that a is now bound to something Binding a name to something makes that name a value and then the type information of the binding is displayed All values are constant within their scope References are also constant, although the value they refer to can be mutable.

The HTML page is produced using Markaby. The first part of the code that uses Markaby is as follows:

It s time to run the application to check our results. Once again, you ll be prompted to add a web.config to the site. Accept the defaults and wait for the application to load. Go ahead and click the Get XML button and watch in amazement as our XmlHttpRequest loads and displays our complex data structure, as shown in Figure 3-10.

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