- Source control systems. I started with VSS, then moved on to SVN, and now I'm seeing stuff appear in GIT. For a while I thought a convergence on Subversion from CVS and Visual SourceSafe users, well-supported tools like TortoiseSVN, and free hosting like Google Code might mean a new era in source sharing. Now I'm wondering if I need to learn GIT in order to get some of the bleeding-edge libraries.
- Language features. PHP4 had poor class and object support, PHP5 fixed that. Classes between these two major releases may not work without major tweaking. Likewise in the world of C# there are classes and namespaces which pop up and then fall under the axe of deprecation. Solid code left unmaintained becomes unusable until refactored.
- Software licenses. The battlefield between proprietary and GPL is littered with corpses ... and zombies. Simpler licenses like MIT/BSD get out of my way whereas tiny bits of code tagged with GPL are cringe-inducing. I still don't think I figured out if mixing GPL and BSD (what I use) is okay. Restrictive licenses tear up focus and force me to start thinking about confusing legalities.
What else is preventing you from re-using some piece of code versus writing your own?
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