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The two other common aggregate functions used when working with data are max and min, which, as you might expect from their names, return the maximum value and minimum values found in a resultset. In the employee database, you might want to find out what the highest and lowest salaries are. Let s find out how to do this using a CouchDB view (Listing 9-5). Listing 9-5. Finding the Highest and Lowest Salaries map: function(doc) { if(doc.department) emit("Max and Min", doc.salary); } reduce: function(keys, values, rereduce) { var max, min; if(rereduce == false) { max = values[0]; min = values[0]; for(item in values) { if(values[item] > max) max = values[item]; if(values[item] < min) min = values[item]; } return { "max": max, "min": min }; } else { max = values[0].max; min = values[0].min; for(item in values) { if(values[item].max > max) max = values[item].max; if(values[item].min < min) min = values[item].min; } return { "max": max, "min": min }; } } In Listing 9-5, you use the reduce function to initialize the max and min variables and then loop through the values sent to the reduce function to check whether the value is greater than or less than the current max and min values. You then return the max and min values.

Sys.Debug.trace("I'm a debug message.");

Software and operating system: Make sure you ve updated to iTunes 7.4 or later. And, if you re using a Macintosh, make sure you ve updated your operating system to at least OS X 10.4.10. You can download the latest version of iTunes from Apple at http://www.apple.com/itunes/download.

You will notice in this example that you check to see whether the value of the rereduce argument is false. On large data sets, CouchDB breaks down the data sent to the reduce function and processes it in smaller batches. When these batches are processed, they return a value to the reduce function and set the value of rereduce to true. In this example, if rereduce is false, the values argument will be an array of the values emitted by the map function in this case the salary field of each document. You then process these salaries to find the maximum and minumum values and return a JSON object with two fields, max and min. If rereduce is true, the values argument will be an array of values returned by previous calls to the reduce function, in this case, the JSON objects with max and min fields. Once again, you return a JSON object with maximum and minumum values (Figure 9-4).

iTunes Account: If you plan to purchase music using the iPod s iTunes Wi-Fi Music Store, Apple requires a current iTunes account. If you don t already have one, you can sign up for a US account as described next.

You can also dump an object by passing it to the Sys.Debug.traceDump method. An object dump displays all the properties of an object, together with their values, and can be helpful during debugging. The following example logs to the console the properties of the object returned by the getBounds method of the Sys.UI.DomElement class:

Figure 9-4. Finding the highest and lowest salaries Of course, if you wanted the max and min values for each department, you can simply change the key in the map function to doc.department, and it will group the results by department accordingly. You might be wondering what good this information is to you when you don t know which employee has the