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

Indexers are a .NET concept that are designed to make a collection class look more like an array. Under the hood an indexer is a special property that is always called Item and has one or more parameters. It is important you have easy access to an indexer property, because many classes within the BCL have indexers. In respect to syntax, F# offers two ways of using an indexer. You can explicitly use the Item property, or you can use an array-like syntax, with brackets instead of parentheses around the index. open System.Collections.Generic let stringList = let temp = new ResizeArray<string>() in temp.AddRange([| "one" ; "two" ; "three" |]); temp let itemOne = stringList.Item(0) let itemTwo = stringList.[1] printfn "%s %s" itemOne itemTwo This example associates the strings "one" and "two" with the identifiers itemOne and itemTwo, respectively. The association of "one" with itemOne demonstrates explicitly using the Item property. The association of "two" with itemTwo uses the bracket syntax.

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The NXT port plugs are similar to RJ-12 modular telephone connectors with six contacts. However, the lock of the cable is on the side of the connector, instead of the middle, for a standard RJ-12 connector. Note that there are connectors, known as DEC connectors, that also have a side lock, but on the wrong side. Figure 3-8 illustrates an NXT cable and a standard RJ-12 connector.

I Note This example also demonstrates a common pattern in F#. Note how you want to create the identifier

Figure 7-28. Right-click in the Watches window (left), and then enter the name of the variable you want to watch (right).

NXT plugs (see Figure 3-9) can be purchased from http://mindsensors.com. An RJ-12 crimping tool (shown in Figure 3-10) must be modified to crimp the plugs. You will find detailed instructions for doing this on Philo s web site: http://www.philohome.com/crimp/crimp.htm. You will also need flat 6 conductor wire, designed for telephone use. Fortunately, the color and order of the wires exactly matches those of the NXT cable.

stringList as an object from a non-F# library and at the same time initialize it to a certain state. To do this

Remember that the Watches window will show all variables you want to watch. However, sometimes you may want to watch variables that are not within the current scope of the script. For example, if you create a watch for variable foo in function doThis, and you are stopped at a breakpoint in function doThat, then variable foo from doThis is not in scope. When this happens, Venkman will simply report a variable value of {Error}. Don t worry, this won t cause any problems it s just Venkman s way of letting you know that the variable is not currently in scope. In many cases, you ll want to use the Watches window more than you use the Local Variables window, simply because you get to decide what appears in the window. This leads to a much cleaner window and less time searching for the few variables you actually care about tracking. Figure 7-29 shows three variables. The variable url is defined in another function, so its value is reported as {Error}. The variable xmlHttp is a global variable and thus shows the current value. The variable queryString is defined within the function in which script execution is currently suspended.

you assign the object to a temporary identifier and then call an instance member on the object to manipulate its state. Finally, you return the temporary identifier so it becomes the value of stringList. In this way, you keep the object creation and initialization logic close together.

If the LEGO connectors aren t available or if you want to make your own, you can modify a telephone RJ12 plug as explained in the following sections. However, be careful when choosing the cables to modify. The RJ-12 cables have six conductors on six positions, while RJ-11 cables (standard telephone cables) have four conductors on six positions, RJ-9 cables have four conductors on four positions, and RJ-45 (standard network cables) have eight conductors on eight positions (see Figure 3-11). There s no need to buy already-made RJ-12 cables. You can also buy cable and connectors, and crimp them yourself using a low-cost tool.