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This essentially forms the basis of JSON (JavaScript Object Notation). Data that is in the form of JSON is often used as a communication mechanism between clients and servers. If you are not familiar with the idea you may want to read up on JSON (http://json.org) as you will want to use something like this to communicate with web servers to retrieve or save data over HTTP. Let us now talk briefly about anonymous functions. Consider the following example (Listing 17 19).

Listing 17 19. Anonymous Functions function Person() { var age = 40; //init value this.setAge = function(howold) { age = howold }; this.firstname = "First"; this.lastname = "Last"; }

Summary

var me = new Person(); me.firstname = "aaaa"; me.lastname = "bbbb"; me.setAge(25); //the following will be wrong me.age=44;

You can use module types to create different views of the same module. module type CONTROL_ACCT_NUM = sig val set_base: string -> unit val next: unit -> string val reset: unit -> unit end;; module type ACCT_NUM = sig val next: unit -> string end;; module Cacc_num:CONTROL_ACCT_NUM = struct type counter = {mutable base:string;mutable count:int } let base = {base="base";count=0} let set_base x = base.base <- x let base_to_string x = Printf.sprintf "%s-%i" x.base x.count let next () = (ignore(base.count <- base.count + 1);base_to_string base) let reset () = base.count <- 0 end;; module Uacc_num = (Cacc_num:ACCT_NUM);;

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In the example above, the member setAge is defined as an anonymous function with access to the private variable age, whereas the firstname and lastname are public variables. We will conclude this section with a discussion of JavaScript namespaces, as they are used quite a bit in JavaScript-based libraries. Consider the following pattern (Listing 17 20), which is often quoted as an approach to maintain namespaces in JavaScript.

In this chapter, we discussed two important parts of the Android SDK: the application-security model and location-based services. With respect to security, you learned that Android requires all applications to be signed with a digital signature. We discussed ensuring build-time security with the emulator and Eclipse, as well as signing an Android package for release. We also talked about runtime security you learned that the Android installer requests the permissions your application needs at install time. If a particular permission is denied, then any code that attempts to access a resource protected by a permission will result in a permission exception. We also showed you how to define the permissions required by your application, as well as how to sign the .apk file for deployment. With respect to location-based services, we talked at length about using the MapView control and the MapActivity class. We started with the basics of the map and then showed you how to utilize overlays to place markers on maps. We even showed you how to geocode and handle geocoding in background threads. The last thing we talked about was the LocationManager class, which provides detailed location information through providers. You can choose from two provider types: GPS and Network. GPS providers obtain location information using Global Positioning Systems, while network providers utilize cell towers and WiFi networks. In the next chapter, we ll talk about building and consuming services in Android.

Listing 17 20. JavaScript Namespaces var MY_NAME_SPACE = function() { return { method_1 : function() { // do stuff here }, method_2 : function() { // do stuff here } }; }();

One of the interesting effects is that it creates the same effect of the singleton design pattern. The module system provides a kind of singleton-esque management at a global level. You can see this in action in the following snippet: # # # # Uacc_num.next ();; : string = "base-1" Uacc_num.next ();; : string = "base-2" Cacc_num.next ();; : string = "base-3"

It is quite revealing to understand this type of JavaScript coding pattern. At a high level the above code allows you to do the following:

MY_NAME_SPACE.method_1(); MY_NAME_SPACE.method_2();

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