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Figure 9-1. Results of the count view Now let s change the view slightly so that it returns the total salary for each department. To do this, you simple emit the salary field as the value in the map function. Listing 9-2 shows the code for this sum view (with changes from Listing 9-1 in bold). Listing 9-2. Finding the Total Salary by Department map: function(doc) { if(doc.department) emit(doc.department, doc.salary); }

The iTunes icon on the button bar at the bottom of your iPod s home screen launches the iTunes Wi-Fi Music Store application. It is colored purple and shows a white arrow pointing down (see Figure 7-1).

<span id="urlLabel"></span> <script type="text/javascript"> <!-function pageLoad(sender, e) { var sb = new Sys.StringBuilder(); sb.append('<h3>You are now browsing: '); sb.append('<b><i>'); sb.append(window.location); sb.append('</i></b></h3>'); var myLabel = $get('urlLabel'); urlLabel.innerHTML = sb.toString(); } //--> </script>

reduce: function(keys, values, rereduce) { return sum(values); } The new view should return a result like the one in Figure 9-2.

Figure 7-1. The iTunes application icon appears on your home screen at the bottom right of your iPod s button bar.

To add the various parts to the final string, you pass them to the append method. When you re done, you call the toString method to get the whole string stored in the StringBuilder instance. The Sys.StringBuilder class also supports an appendLine method that adds a line break after the string passed as an argument. The line break is the escape sequence \r\n, so you can t use it when building HTML. Instead, you write something like this:

Figure 9-2. Results of the sum view Now let s try something a bit trickier. Let s get the average salary by department. This time, the map function can stay the same, but you need to change the reduce function, telling it to calculate the average salary instead of the total salary (Listing 9-3). Listing 9-3. Finding the Average Salary by Department map: function(doc) { if(doc.department) emit(doc.department, doc.salary); } reduce: function(keys, values, rereduce) { var total = sum(values);

When you tap the iTunes icon, the application attempts to connect to Apple s storefront web server. Because of this, you must be located near a Wi-Fi hotspot and be connected to the Internet to use this application.

sb.append('<br />');

return Math.round((total / values.length) }

When your connection is not active or not strong enough to carry a signal, the music store application displays the error message shown in Figure 7-2. To resolve this problem, return to your home screen and tap Settings Wi-Fi. Make sure your iPod is connected to a wireless network and that the signal registers at the top left of your screen with at least one arc (and preferably three arcs). See 3 for details on checking your Wi-Fi connection. When your signal is weak, try moving physically closer to the wireless router serving your network.

You can use the isEmpty method to test whether a StringBuilder instance doesn t contain any text. The following if statement performs this check and, if the StringBuilder isn t empty, clears all the text using the clear method:

*100) / 100;

s It never hurts to ask where the router is. Sometimes the physical layout of a room (such as the large Tip

if(!sb.isEmpty()) { sb.clear(); }

metal furnishings common in diners) may block your Wi-Fi signal in certain locations and not in others.

In this view, you are finding the total salary for each department, and then you are finding the average by dividing this total by the number of employees in the department. In this example, you are using the Math.round JavaScript function to round your result to two decimal places. The result should look something like Figure 9-3.

Figure 7-2. The iTunes Wi-Fi Music Store requires a Wi-Fi network connection. You won t be able to access the store without one.

When the number of strings to concatenate is larger, the string builder becomes an essential object to avoid huge performance drops. The Sys.StringBuilder class relies on an array to store the strings to concatenate. Then, it uses the join method of the String object to perform the concatenation and obtain the final string. Arrays are probably one of the most used data structures in programming. JavaScript provides a built-in Array object that the Microsoft Ajax Library extends with methods commonly found in the .NET Array class.