1.Introduction to Java Script Programming Language

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JavaScript is a powerful, complicated, and often misunderstood computer language. It enables the rapid development of applications in which users can enter data and view results easily.

JavaScript is a great programming language for introductory computer languages. It allows instant feedback to the new student and teaches them about tools they will likely find useful in their real life. This is in stark contrast to C, C++, and Java which are really only useful for dedicated software developers.

JavaScript is an interpreted computer programming language formalized in the ECMAScript language standard. JavaScript engines interpret and execute JavaScript. JavaScript engines may be designed for use as standalone interpretors, embedding in applications, or both. The first JavaScript engine was created by Netscape for embedding in their web browser. V8 is a JavaScript engine created for use in Google Chrome and may also be used as a standalone interpretor. Adobe Flash uses a JavaScript engine called ActionScript for development of Flash programs.

The primary advantage to JavaScript, which is also known as ECMAScript, centers around the Web browser, thus having the ability to produce the same results on all platforms supported by the browser. The examples on this page, just like Google Maps, run on Linux, Windows, and OS X. With the recent growth of numerous JavaScript libraries it is now easier to navigate a document, select DOM elements, create animations, handle events, and develop Ajax applications. Unlike the hype around other technologies pushed by various proprietary interests, JavaScript is really the only cross-platform, client-side programming language that is both free and universally adopted.

JavaScript and Java
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java’s static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.

In contrast to Java’s compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.


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