I still think in iterations and loops and if statements, often convoluted ones. I'm trying to work in more succinct functions, and this site is brilliant at showing alternative and often very short solutions.

Thanks for your response!

This is an interesting way of doing it. Original, unelegant, but then again, nothing is elegant the closer you get to the 1's and 0's. Have gone and updated the description not the modifiy the original array.