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Our master program is getting pretty advanced: it keeps our programs in order, has some smooth navigation features, and even displays the name of the program we re running (or about to run). What happens if the master program gets shut off on accident When you start it up again, the sequence will start back at the beginning. This isn t too much of a crisis, since we can simply use our navigation buttons to move to the program that we wanted to run next. But what if, in all the confusion, you forget what program is next Wouldn t it be nice if the NXT could remember where in the sequence it was before the master program stopped We refer to remembering our place in the sequence as saving state. We can keep a file on the NXT brick that stores the value of the current sequence order. Every time we change the sequence order, we update this file and write the value to the file, and every time the master program starts up, it can read this file and discover where it was last. Figure 11 17 shows some sample NXT-G code that will read from a file when the program starts and pass the numeric value into our Number 1 variable. If the file does not exist on the system, the value of 0 is placed in the Number 1 variable. Now, the code will loop continuously with a wait for the NXT orange button press; this is similar to our sequencer code examples. Each time the orange NXT button is

Figure 1-11. The output of Listing 1-18

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Figure 4 8 Iterating over an array with a while loop Here we have a looseLeafTea array with nine elements Prior to running the while loop, we initialize a loop variable named i to 0, the index of the first element in looseLeafTea For the while loop s boolean expression, we test whether i is less than looseLeafTealength, which is 9 At the very end of the while path, we add 1 to i with the ++ operator In this way, the loop will run at most nine times, one iteration per element in looseLeafTea During a particular roundabout of the while path, we can query the next element in looseLeafTea with i and the [] operator So, for example, during the fourth iteration i would be 3 (remember it started at 0), and so looseLeafTea[i] would be "Keemun" This behavior is typical of a loop.

That is to say, on each roundabout you have JavaScript run the same set of commands on a different variable, member, or element So, loops provide a way to do things in a batch It s kind of like baking oatmeal cookies! Now, unless we tell JavaScript otherwise, it will take all nine roundabouts of the while path There s no harm in that, but it is inefficient In the event that an element contains "Borpatra", then there s no need to loop through the remainder of looseLeafTea To tell JavaScript that enough is enough, we add break statement to the while loop Doing so tells JavaScript to move past the while statement and continue with the next statement in the script, which in our case glues mood to a couple of other strings.

Dim query = From m In GetType(Integer).GetMethods() _ Group By m.Name _ Select New {Name := it.Key, Overloads := it.Count} ObjectDumper.Write(query)

bumped, the variable Number 1 will be incremented by 1. Then, the file where we are saving our state value is deleted so that we can re-create the file by writing the new value to the file. Before the loop starts over, we close the file. The reading, writing, deleting, and closing are all done with the NXT File Access block.

So, our while loop eliminated the drudgery of having to write separate if conditions for the nine elements in looseLeafTea like so: var looseLeafTea = [ "Ghillidary", "Kenilworth", "Milima",.

The it variable represents the result of the Group By operation; it s possible to operate against this variable to filter its element, specify a Where clause, and so on. In this case the code snippet shows the result of counting the number of elements for each key in the group. In this case it represents the method s overloads. See Figure 1-12 for the output.

"Keemun", "Boisahabi", "Manohari", "Borpatra", "Lukwah", "Khongea" ]; var mood = "glum"; if (looseLeafTea[0] === mood = "cheery"; } if (looseLeafTea[1] === mood = "cheery"; } if (looseLeafTea[2] === mood = "cheery"; } if (looseLeafTea[3] === mood = "cheery"; } if (looseLeafTea[4] === mood = "cheery"; } if (looseLeafTea[5] === mood = "cheery"; } if (looseLeafTea[6] === mood = "cheery"; } if (looseLeafTea[7] === mood = "cheery"; } if (looseLeafTea[8] === mood = "cheery"; } "I feel " + mood + "!"; // "I feel cheery!" "Borpatra") { "Borpatra") { "Borpatra") { "Borpatra") { "Borpatra") { "Borpatra") { "Borpatra") { "Borpatra") { "Borpatra") {

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