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How to Do Everything with JavaScript
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The ability to write scripts that can be compiled for faster performance The ability to restrict the way functions and code are used
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The ECMA has actually designed JavaScript 20 with these goals in mind
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Use JavaScript as a Client-Side Language
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One of the unique qualities of the core JavaScript specification is that it does not attempt to define how JavaScript interacts with its environment There are no JavaScript methods or functions in this specification that define how to draw the user interface or how to write text to the screen Likewise, there are no file input/output routines that allow the language access to the hard drive That feature can be considered both a strength and a weakness The flexibility given by this lack of a standard I/O interface has resulted in JavaScript s use in many different environments (browsers, servers, stand-alone applications, mobile devices, etc) This has allowed devices with different ways of storing data and different ways of displaying output to run JavaScript applications The downside to this flexibility is that the same JavaScript application cannot be run in each environment without some alteration While most web browsers have standardized on a document object model, some differences remain between the DOMs of various browser makers For example, a JavaScript application designed to run in a web browser cannot be run on a web server without taking the server s own object model into consideration Today, JavaScript is practically the only scripting language used inside web pages Even though a couple of alternatives exist (most notably VBScript), JavaScript was (and still is) the only scripting language supported by all the major browser manufacturers It is the only scripting language worth learning for client-side development
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Use JavaScript as a Server-Side Language
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JavaScript also gained some popularity as a web server programming language Both Netscape Enterprise Server and Microsoft IIS (popular web servers of the mid-1990s) supported serverside JavaScript development Netscape supported this through the LiveWire server-side language Microsoft allowed JScript as one of the potential languages for ASP development Unfortunately, Netscape Enterprise Server (now called iPlanet Web Server) no longer supports JavaScript on the server, starting with version 6 This might have something to do with the fact that iPlanet is part of Sun Microsystems, and Sun Microsystems prefers programmers to use Java And although Microsoft s ASP environment has been hugely successful, developers prefer to use VBScript when developing for that platform With the introduction of Microsoft s ASP NET platform, VB NET and C# have become the two languages developers use most Microsoft did the JavaScript community a small favor when it included JScript NET support in the Visual Studio NET development environment JScript NET has access to all the classes of the NET Framework, and was the first (albeit, extremely early) implementation supporting features of the ECMAScript Edition 4 proposal
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CHAPTER 1: Prepare to Program in JavaScript
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Although the ECMA has given JavaScript the ability to function as a full programming language, JavaScript is not necessarily suitable for every environment You would probably not want to use JavaScript as a programming language for the following types of tasks:
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Very large applications Performance-critical applications Device drivers and other low-level programs
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After all, we wouldn t want to see all those C++ programmers out of a job, would we
Decide Which Version of JavaScript to Use
One decision that JavaScript developers must make early on in the development process is which version of the language they wish to support Several factors go into this decision, such as:
The size and scope of the programming task at hand The possibility of future enhancements to the program The need for the program to easily interoperate with other programs written in different
programming languages
The need to take advantage of new features only offered in JavaScript 20 (new built-in
objects, for instance)
The version of JavaScript supported by your favorite development tool The version of JavaScript supported by the vast majority of your intended audience
By far the most important consideration would be the last one There is no point placing JavaScript 20 inside web pages if a significant amount of your intended audience still uses browsers that don t support it Of course, if your program will reside only on the server (a server-side program), all that matters is the version supported by the server It is also important to remember one of the fundamental rules of computer programming: never write more code than is absolutely necessary for a task So if your JavaScript program is a three-line script that converts degrees Celsius to degrees Fahrenheit, there is no need to create packages and classes in JavaScript 20 syntax (as discussed in 5) You may want to do it for other reasons, including future extensibility of your program But this is also a case of if it ain t broke So as a general rule, be very cautious about developing in client-side JavaScript 20 code if your intended audience is likely to be running a wide variety of web browsers Otherwise, if you know for certain what the minimum browser version will be or are developing in a server or embedded environment, feel free to use the new features and improvements in JavaScript 20 to your heart s content!
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