Are you kidding me!! lol
The array functions are SO nice. Most of you must know about these. For whatever reason, I didn't. I do now.
I've implemented my own array sort functions. I've had to handle null elements. I've worried about pre-defining array sizes to handle worst case scenarios. I had no clue these are built-in features. Anyway - if you didn't know, here are just a few of the functions.