Web applications are one of today's fastest
growing software systems. Structurally, they are composed of two parts: the
server side, used for data access and business logic, and the client side, used
as a user interface. In recent years, with developers building complex
interfaces, the client side is playing an increasingly important role.
Unfortunately, the techniques and tools used to support development are not as
advanced as in other disciplines. From the user's perspective, the client side
offers a number of features that are relatively easy to distinguish. However,
the same cannot be said for their implementation details. This makes the
understanding, maintenance, and reuse of code difficult. The goal of the work
presented in this paper is to improve reusability, maintainability, and
performance of client-side web applications by identifying the code that implements
a particular feature. We have evaluated the approach based on three different
experiments: extracting features, extracting library functionalities, and page
optimization. The evaluation shows that the method is able to identify the
implementation details of individual features and that by extracting the
identified code, a considerable reduction in code size and increase in
performance can be achieved.
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