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

As you work with Venkman, you ll get a feel for the windows that you use most often. Close the windows you don t often use by clicking the X button on the right side of the window s title bar. You can reopen windows by selecting the View Show/Hide menu item. If at any time you want to return the window layout to the default setting, simply use /restore-layout factory at the command-line interface.

I Caution Just because a function is named main doesn t mean it is the entry point of the program and is

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The phototransistor in the Light Sensor is far more sensitive to the infrared colors of light than the relatively narrow visible spectrum we see. This can be confusing because it sees hot light sources such as incandescent light bulbs as being much brighter than we do. Figure 1-10 shows how the transistor s spectral response overlaps the human eye.

When Venkman is open, it recognizes all the JavaScript that is available to the page currently open in the browser window. Venkman recognizes JavaScript that is embedded within the HTML page using <script> tags and also recognizes external JavaScript files that are included in the HTML page using <script src="js_file.js"> tags. Venkman displays the currently available JavaScript in the Loaded Scripts window. Clicking the plus sign next to each file opens a list under the file that details all the available JavaScript functions within that file along with the line number at which the function occurs within the file and optionally the number of lines of code the function encompasses, as shown in Figure 7-11. Double-clicking a file within the Loaded Scripts window opens the file in the Source Code window and also scrolls directly to the function within the Source Code window. Right-clicking a file in the Loaded Scripts window displays a number of options for both the file itself and the JavaScript functions contained within the file, as shown in Figure 7-12. For the file, this pop-up menu allows you to performs tasks such as disabling the debugging of eval and timeout statements, disabling the debugging of contained functions, and disabling the performance monitoring of contained functions. For individual functions, the context menu provides facilities for disabling the debugging and performance profiling.

executed automatically. If you wanted your main function to be executed, then you would need to add a call to main() at the end of the source file. 6 details exactly how the entry point is determined for an F# program.

Figure 1-10. Light Sensor spectral response We ll discuss light sensitivity in more detail in 5 when we make our own Light Sensors. (Looking ahead, Table 5-1 has the average light intensity of various locations.) Figure 1-11 shows the sensitivity of the NXT sensor over a wide range of light intensities, which is usually measured in units of lux (lx).

Similarly, by placing () after the equals sign, you tell the compiler you are going to return nothing. Ordinarily, you need to put something between the equals sign and the empty parentheses, or the function is pointless; however, for the sake of keeping things simple, I ll leave this function pointless. Now you ll see the type of main by using the fsc i switch; the results of this are as follows. (I explained the notation used by the compiler s i switch in 3 s Types and Type Inference. ) As you can see, the type of main is a function that accepts unit and transforms it into a value of type unit: val main : unit -> unit Because the compiler now knows the function doesn t return anything, you can now use it with some special imperative constructs. To call the function, you can use the let keyword followed by a pair of parentheses and the equals sign. This is a special use of the let keyword, which means call a function that does not return a value. Alternatively, you can simply call the function without any extra keywords at all: #light let () = main() // -- or -main() Similarly, you can chain functions that return unit together within a function simply make sure they all share the same indentation. The next example shows several print_endline functions chained together to print text to the console: #light let poem() = print_endline print_endline print_endline print_endline poem()