micky0604
29th August 2008, 01:28 PM
JavaScript is often ridiculed as the black sheep of programming languages. The development tools, a complicated and inconsistent document object model for HTML pages, and inconsistent implementation in browsers contributes to that sentiment. But JavaScript is much more than a toy. Nearly every Web developer has cursed JavaScript at one time or another. The beleaguered language sags under the weight of a complex programming model called the document object model (DOM), poor tools for implementation and debugging, and inconsistent browser implementations. Until recently, many developers had all but written off JavaScript as a necessary evil at best or a toy at worst. But JavaScript is becoming increasingly important, and it remains the most broadly available scripting language for Web development. Some industry leaders are taking a fresh look at JavaScript, driven by the resurgence of its use. Programming techniques like Ajax (Asynchronous JavaScript + XML) make Web pages more interactive. Full Web development frameworks, such as Apache Cocoon, make increasing use of JavaScript beyond simple scripts on a Web page. A JavaScript derivative called ActionScript powers Macromedia's Flash client-side framework. And Rhino, the implementation that runs in the JVM, makes JavaScript available to Java developers as a first-class scripting language.
This article explores features of JavaScript that make it so wonderfully attractive:(1) Higher-order functions. A high-order function is one that either takes functions as arguments or returns a function. This feature lets JavaScript programmers manipulate functions in ways that the Java language can't. (2) Dynamic typing. By delaying binding, JavaScript can be more concise and flexible. (3) A flexible object model. JavaScript's object model uses a relatively uncommon approach to inheritance — called prototypes — instead of the Java language's more common class-based object model.
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