Most of the beginners and, sometimes, even more advanced programmers, want to develop everything from scratch because they want have control over the every aspect of their application. I entirely understand this tendency. When you learned how to program and you can code nearly anything you want (this relates more closely to scripting languages like php, perl, js etc), you start to do something global. Something that will change the world. This may be a new CMS, a new framework, new blog of e-commerce engine. And when you start this, you want to code it in the most efficient way, optimizing every little thing: every function, every SQL query. At the same time, you want to reuse the code you’re writing. So you tend to create more general solutions than you really need. And this slows down the performance. And again you go into optimization, limiting the possible uses to some extent.
Finally, if you finish your application, it may be faster or better than similar ones (however, usually it is the same or worse), but remember how much time you spent developing it. Yes, you’re proud of yourself – you’ve created your own DB abstraction layer, that handles SQL injections in a very smart way. You’ve also developed your own ORM engine, that goes nicely with your DB abstraction layer. It is quite likely, that you’ve already created your very own template engine and a nice JS library that makes animation very easy. Great job, my fellow programmer!
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