Simple .NET/ASP.NET PDF document editor web control SDK

represent the end of a list The Some constructor must contain a tuple The first item in the tuple represents the value that will become the first value in the list The second value in the tuple is the value that will be passed into the function the next time it is called You can think of this value as an accumulator The next example shows how this works The identifier lazyList will contain three values If the value passed into the function is less than 13, you append the list using this value to form the list element and then add 1 to the value passed to the list This will be value passed to the function the next time it is called If the value is greater than or equal to 13, you terminate the list by returning None.

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To display the list, you use the function display, a simple recursive function that processes the head of the list and then recursively processes the tail #light let lazyList = LazyListunfold (fun x -> if x < 13 then Some(x, x + 1) else None) 10 let rec display l = match l with | LazyListCons(h,t) -> print_int h print_newline () display t | LazyListNil -> () display lazyList The results of this example, when compiled and executed, are as follows: 10 11 12 Lazy lists are also useful to represent lists that don t terminate A nonterminating list can t be represented by a classic list, which is constrained by the amount of memory available.

Figure 13-19. Relay output The circuit is essentially the same as the previous designs, and it should be easy to figure out how to build it onto a solderless breadboard, as shown in Figure 13-20. The short wire lead is used to make contact temporally with pins 4 or 5 on the PCF8574 while running the Low2High program to test the relay operation.

values with Script Debugger. Open the Command Window by clicking the menu bar button or by selecting the View Command Window menu item. The Command Window interface is entirely text based. It has no list of available objects to inspect or collapsible list of the object s properties under each object. You must know the name of the variable you want to inspect; it could be a JavaScript object, an object property, or the property of some item that appears on the page. To view the variable value, simply type the variable name in the Command Window, and hit the Enter key. The variable s value should display on the following line. The process for updating the variable s value is similar to viewing its value. To update the variable s value, type the variable name followed by an equals sign, followed by the desired new value. If the value is a string, then you must enclose it within quotation marks. You can also set values to other objects by simply following the equals sign with the object variable name. Figure 7-8 shows an instance of inspecting a variable value and then changing it. First we entered the variable name, queryString, into the Command Window, and pressed the Enter button, which displays the value of queryString on the following line. Next, we entered a line assigning a new value for queryString, with the new value being echoed after we pressed the Enter button. Finally, we inspected the value of queryString again to ensure that the new value was correctly set.

The next example demonstrates this by creating fibs, an infinite list of all the Fibonacci numbers; it uses the Seq module, although it could just as well have used the LazyList module because the unfold function works in the same way in both To display the results conveniently, you use the function Seqtake to turn the first 20 items into an F# list, but you carry on calculating many more Fibonacci numbers as you use F# bigint integers, so you are limited by the size of a 32-bit integer..