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  1. Leonardo Humberto Silva, Marco Túlio Valente, Alexandre Bergel, Nicolas Anquetil, and Anne Etien. Identifying Classes in Legacy JavaScript Code. In Journal of Software: Evolution and Process, 2017. DOI URL 
    Abstract

    JavaScript is the most popular programming language for the Web. Although the language is prototype-based, developers can emulate class-based abstractions in JavaScript to master the increasing complexity of their applications. Identifying classes in legacy JavaScript code can support these developers at least in the following activities: (i) program comprehension; (ii) migration to the new JavaScript syntax that supports classes; and (iii) implementation of supporting tools, including IDEs with class-based views and reverse engineering tools. In this paper, we propose a strategy to detect class-based abstractions in the source code of legacy JavaScript systems. We report on a large and in-depth study to understand how class emulation is employed, using a dataset of 918 JavaScript applications available on GitHub. We found that almost 70\% of the JavaScript systems we study make some usage of classes. We also performed a field study with the main developers of 60 popular JavaScript systems in order to validate our findings. The overall results range from 97\% to 100\% for precision, from 70\% to 89\% for recall, and from 82\% to 94\% for F-score.