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JavaScript is a scripting language that can be used to write scripts that interact with web pages JavaScript is a language that is separate and distinct from Java, but derives its name from its Java-like syntax JavaScript code can be included within HTML web pages, and the code is executed by a JavaScript interpreter once downloaded to the web browser We cover JavaScript in this chapter for two reasons: (1) sometimes programmers rely on JavaScript for tasks that they should not, and (2) sometimes attackers can use JavaScript to help construct attacks We illustrate how using JavaScript carelessly can give rise to a security vulnerability in this section, and provide a description of how attackers can use JavaScript to construct more attacks in 10.

The approach in Example 2-16 would be better than the previous examples for a particularly large file. The code can start working straight away without having to wait for the entire file to load, and it will use less memory because it doesn t build the array containing every single line it can hold just one line at a time in memory. For our example lap time file with just six lines of data, this won t make any difference, but if you were processing a file with hundreds of thousands of entries, this while-based example could provide noticeably better performance than the array-based examples.

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This does not mean that while is faster than for or foreach. The performance difference here is a result of the code working with the file in a different way, and has nothing to do with the loop construct. In general, it s a bad idea to focus on which language features are fastest. Performance usually depends on the way in which your code solves a problem, rather than which particular language feature you use.

Note that for and while loops might never execute their contents at all. If the condition is false the first time around, they ll skip the loop entirely. This is often desirable if there s no data, you probably want to do no work. But just occasionally it can be useful to write a loop that is guaranteed to execute at least once. We can do this with a variation on the while loop, called the do while loop:

do { Console.WriteLine("Waiting..."); } while (DateTime.Now.Hour < 8);

The while keyword and condition come at the end, and we mark the start of the loop with the do keyword. This loop always executes at least once, testing the condition at the end of each iteration instead of the start. So this code will repeatedly show the message Waiting... until the current time is 8:00 a.m. or later. If it s already past 8:00 a.m., it ll still write out Waiting... once.

In the following example, we show some JavaScript that can be used to help compute the price of an order: <HTML> <HEAD> <TITLE>Order Pizza</TITLE> </HEAD> <BODY> <FORM ACTION="submit_order" METHOD="GET" NAME="f"> How many pizzas would you like to order <INPUT TYPE="text" NAME="qty" VALUE="1" onKeyUp="computePrice();"> <INPUT TYPE="hidden" NAME="price" VALUE="550"><BR> <INPUT TYPE="submit" NAME ="Order" VALUE="Pay"> <INPUT TYPE="submit" NAME ="Cancel" VALUE="Cancel"> <SCRIPT> function computePrice() { fpricevalue = 550 * fqtyvalue; fOrdervalue = "Pay $" + fpricevalue } </SCRIPT> </BODY> </HTML> The preceding pizza order form looks similar to ones used earlier in the chapter, with just a few differences that help the browser compute the price of the order First, the form has been given a name attribute that specifies that its name is f.

For years, processors managed to double CPU performance on a regular basis a new processor would do everything that the one you bought a couple of years ago could do, but twice as fast. We were in the luxurious position where our code just got faster and faster without having to do anything, and because the growth was exponential doubling up again and again the cumulative effects were astounding. Computers are tens of millions of times faster than they were a few decades ago. Sadly, that all stopped a few years ago because we started running into some harsh realities of physics. In response to this, CPU vendors have switched to providing more and more logical processors as a means of continuing to deliver processors that are, in some sense, twice as fast as the ones from a couple of years ago. They can do this because even though clock speeds have stopped doubling up, Moore s law that the number of transistors per chip doubles roughly every two years is still in action for the time being.

Unfortunately, the doubling in speed between a single-core and dual-core system is hypothetical Technically, the dual-core system might be able to perform twice as many calculations as the single-core one in any given length of time, but this is an improvement only if it s possible to divide the work the user needs to do in a way that keeps both cores busy, and even if that s possible, it s effective only if other resources in the system such as memory and disk are able to provide input to the calculations fast enough for this double-speed processing Work often cannot progress in parallel.

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