Javascript Online Training In India

Definiton of Javascript :

Javascript is a simple programming language built into Netscape 2.0 and greater. It is integrated with and embedded in HTML. It allows greater control of web page  behavior than does HTML alone. Since the Javascript interpreter is part of Netscape, it is platform-independent: Javascript incorporated into HTML runs on Windows, Macintosh, and other Netscape-supported systems.

Although Javascript resembles Java, it is not the same as Java. Java is a more extensive and powerful, platform-independent programming language, often used to create applet programs which run in Netscape, but also capable of creating stand-alone programs. Javascript gives HTML authors control over Java applet programs. Java is compiled on the server, and the object code is passed to the client for execution; Javascript is interpreted by the client.

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JavaScript is an interpreted programming or script language from Netscape. It is somewhat similar in capability to Microsoft’sVisual Basic, Sun’s Tcl, the UNIX-derived Perl, and IBM’s REXX. In general, script languages are easier and faster to code in than the more structured and compiled languages such as C and C++. Script languages generally take longer to process than compiled languages, but are very useful for shorter programs.

Versions History of Javascript :

1.JavaScript was released as version 1.0 in March 1996 in Netscape Navigator 2.0 and Internet Explorer 2.0.

2.JavaScript 1.1- Version shipped in Netscape Navigator 3.0. Released on August 19, 1996.

3.JavaScript 1.2- Version shipped in Netscape Navigator 4.0-4.05. Released on June 11, 1997.

4.JavaScript 1.3- Version shipped in Netscape Navigator 4.06-4.7x. Released on October 19, 1998. Standardization work to be compliant with ECMA-262 1st and 2nd Edition.

5.JavaScript 1.4- Version shipped in Netscape’s server side JavaScript. Released in 1999.

6.JavaScript 1.5- Version shipped in Netscape Navigator 6.0 and Firefox 1.0. Release on November 14, 2000. Standardization work to be compliant with ECMA-262 3rd Edition.

7.JavaScript 1.6- Version shipped in Firefox 1.5. Released in November 2005.
Includes ECMAScript for XML (E4X), new Array methods plus String and Array generics.

8.JavaScript 1.7- Version shipped in Firefox 2. Released in October 2006.
Includes generators, iterators, array comprehensions, let expressions, and destructuring assignment.

9.JavaScript 1.8- Version shipped in Firefox 3. Released in June 2008.
Includes expression closures, generator expressions and Array.reduce()

10.JavaScript 1.8.1- Version shipped in Firefox 3.5. Released on June 30, 2009.
Includes the TraceMonkey JIT and supports native JSON.

11.JavaScript 1.8.2- Version shipped in Firefox 3.6. Released June 22, 2009.
Includes only minor changes.

12.JavaScript 1.8.5- Version shipped in Firefox 4. Released July 27, 2010.
Includes many new features for ECMA-262 Edition 5 compliance.

Advantages of JS :

There are lot of advantages of using JavaScript in Web Technologies.

Interpreted languages:

JavaScript is an interpreted language. It requires no compilation process so no compiler is required. The browser interprets JavaScript as it HTML tags.
Easy to learn: The syntax of JavaScript is very easy. Any person can learn it very easily and use it to develop dynamic and attractive websites.

Easy to Debug and Test:

JavaScript code is interpreted line by line. The errors are indicated along with line number. It is very easy to find error in the code, correct it and test it gain.

Event-Based Programming:

JavaScript is an event-based language. It means that different code segment are executed when certain event occur. For example, a code segment may execute when the user clicka button or moves a mouse over an object etc.

Procedural Capabilities:

JavaScript provides all capabilities of a procedural language. It provides condition checking, loops and branching facilities that can be executed in a web page.

Platform Independence:

JavaScript is platform independed language. Any JavaScript-enabled browser can understand and interpreted JavaScript code. Any JavaScript code is
executed on different types of hardware a JavaScript program written for.

Speed :

Being client-side, JavaScript is very fast because any code functions can be run immediately instead of having to contact the server and wait for an answer.

Simplicity :

JavaScript is relatively simple to learn and implement.

Versatility :

JavaScript plays nicely with other languages and can be used in a huge variety of applications. Unlike PHP or SSI scripts, JavaScript can be inserted into any web page regardless of the file extension. JavaScript can also be used inside scripts written in other languages such as Perl and PHP. Server Load. Being client-side reduces the demand on the website server.

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