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JavaScript is a scripting language which has nothing to do with Java programming language. It is a very common mistake to think that they are the same or a version of each other, but it is not like that at all.

The name is pretty confusing and it has been exploited to give this scripting language the appearance of being a sort of spin-off of Java programming language. It is true that JavaScript and Java have the same ancestor, C++ and the naming conventions of JavaScript have some copied terms from Java and it is also true that they are both object oriented languages, but they have nothing to do. If JavaScript is named like that it is because of an agreement with Sun Microsystems and Netscape.

The main feature of JavaScript is that it is object based. In this case there is a similarity with Java because they are both the same. In JavaScript, objects are always considered to be associative arrays in terms of programming and the property names of the objects are string keys. JavaScript uses prototypes as well.

As a good object oriented language, most of things on it are objects, even functions. As they are objects they can also have properties and can be interacted as other objects. JavaScript also needs (or it is mostly used in) run-times. The most typical for JavaScript is a web browser. Typically JavaScript is used as a client side programming language for web browser applications. It is said that only amateurs used JavaScript in the past and that was a reason for most programmers to discard this programming language but in the later times with the introduction of AJAX, JavaScript has received another push and it is being more popular between the programming “pros” as it is also easier and more practical to use outside a web browser.

The worst part of JavaScript is probably its low security. In server / client applications the client also has the code necessary and although it is possible to obfuscate it, there are also some methods to reverse this action and will prove useless. Most part of the forms can be easily altered in JavaScript and this is why if a programmer wants full confirmation of something like a terms of service agreement, the confirmation must be done in the server, not only in the client to make sure it is safe.

Another odd thing of JavaScript is that every script can be disabled or not, and this can be used in a malicious way to do things that the client is not supposed to do. On the overall, if security is a must, JavaScript is not a good language.

On the other hand it is very convenient and easy to use so if security is not a big issue, it is one of the most used programming languages for web scripts. JavaScript can also be used outside a web browser, but its usage out of that is not very extended.