The thing is, pre-built code libraries are cool, but they are made to be of use to everyone that means they are packed with options and functions that are cool, but you'll never use.
And because they are standard, the never do exactly what you want, which means you have to adapt to the standard of the library. (If you are smart enough to edit somebody elses libarary, you'd smart enough to write one)
Be carefull that you don't end up including tons of code just because there are a few lines of code you need.
Especially if you are building a high-performance app, you don't want to include standard libraries unless you absolutely have to. A custom-made library is usually faster because it only does what you need, and nothing else.
