Why Reinventing the Wheels?
_{An Empirical Study on Code Reuse and Re-implementation}

RQ1: Why do developers replace their self-implemented method with an external library method?
RQ2: Why do developers replace an external library method with their self-implemented code?
RQ3: How can we improve the current library recommendation techniques?

analytic_scripts folder: contains script to extract code reuse and re-implementation cases for Android apps and Python apps.
real_world_examples folder: contains the results obtained by running the scripts in analytic_scripts.
commit_messages folder: contains the manual classification results on the motivation of code reuse and re-implementations for the data in real_world_examples.

F-Droid: https://f-droid.org/en/
Krutz, D. E., Mirakhorli, M., Malachowsky, S. A., Ruiz, A., Peterson, J., Filipski, A., & Smith, J. (2015, May). A dataset of open-source Android applications. In Proceedings of the 12th Working Conference on Mining Software Repositories (pp. 522-525). IEEE Press.

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