I have found very interesting and handy Clean Code Cheat Sheet, which can help you to be better programmer. This document is actually based on famous book Clean Code: A Handbook of Agile Software Craftsmanship by Robert C. Martin.

You can download the PDF here.

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Reference:

1. Clean Code: A Handbook of Agile Software Craftsmanship (Robert C. Martin)
2. Robert C. Martin by Wikipedia