Refactoring: Improving the Design of Existing Code
Although I bought refactoring book by Martin Fowler years ago it is still valid. I call it one of the timeless books about coding and I consider it as a mandatory reading specially for novice programmers who are entering the field. Of course it is also useful handbook for those already in business. This refactoring book covers and organizes most of changes we are doing to source code every day and it greatly helps us to understand the nature of those changes at crafting level.
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