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function parameter, returning the count of elements against which the specified condition is true. We have already used the Count operator in the Grouping Operator section; see Listing 1-19 for an example of the Count operator.

Figure 5 1. DemoBot with a single Light sensor mounted close to the pivot point Of course, the opposite is true for sensors mounted far ahead of the pivot point, as in Figure 5 2. This forward location is ideal when following an arc, because the robot can make corrections quickly and will not need to make drastic turns. But when traveling on a straight line, more zigzag motion will be seen because the line detection is more sensitive with the Light sensor ahead of the pivot point.

Figure 7 3. Writing the data member changes the nodeValue member, too. Note that this changes the display in Firefox. However, if you press Ctrl+U (Cmd+U) to view the XHTML markup, the link still contains "LinkedIn", as Figure 7 4 displays. So, JavaScript modifies the DOM tree floating around in memory, not the XHTML file on the server.

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<Extension> _ Public Shared Function Sum(ByVal source As IEnumerable(Of Numeric)) As Numeric <Extension> _ Public Shared Function Sum(Of T)(ByVal source As IEnumerable(Of T), _ ByVal selector As Func(Of T, Integer)) As Integer

Finally, let s try ascending cascade style with parentNode. Doing so is much simpler than descending with childNodes insofar as there are no element indexes, muddied by whitespace Text nodes, for you to worry about. So, in Firebug, click Clear in both panels, and save the "Flickr" Text node to a variable named myText. var myText = document. childNodes[1]. childNodes[1]. childNodes[1]. childNodes[3]. childNodes[5]. childNodes[0]. childNodes[0]; Then ascend from myText to the <html> element by chaining parentNode queries. myText.parentNode. parentNode. parentNode. parentNode. parentNode. parentNode; // <html xmlns="http://www.w3.org/1999/xhtml"> Verify your work with Figure 7 5.

Keep the light sensor position and the consequences of its location in mind when analyzing the game field and putting together your strategy for completing the missions. Test frequently and feel free to move the sensor around on your chassis to find what location works best for your design. Do remember that your sensor may need to be recalibrated after each change since its location can have an effect on the light readings.

Figure 7 5. Chaining parentNode queries Note that, while ascending the DOM tree with parentNode from a Text or Element node, you will only ever pass through an Element node, and eventually you will dead end at the Document node. In 9, you will learn to lay event listener functions such as traps along this parentNode path upward through the

The Numeric type returned from the Sum() method must be one of the following: Integer, Nullable(Of Integer), Int64, Nullable(Of Int64), Double, Nullable(Double), Decimal, or Nullable(Decimal).

DOM tree. Those event listeners will then be triggered as event objects move along this parentNode trail. We will cover event objects in 9.