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Security

One of the biggest issues facing Internet development today is security. It is not possible to successfully develop any kind of application, whether it's Web based or based on the Web, and not have to implement some kind of security features. A program's security measures can ultimately determine how valuable the over-all application is to a user. If the code can be tampered with or is subject to destruction from another program, the program will be subject to scrutiny and denial of use.

Since JavaScript is interpreted most often within a browser's environment, a user can be subject to malicious code. Browser's run off the operating system itself, meaning it has access to a user's file system. This makes it feasible that a JavaScript program could take advantage of a hole in the browser's security measures to access the file system. Once a programmer has accomplished this, many things are possible—even access to private documents or the ability to delete them altogether. This leaves a user at the mercy of a hacker.


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