For the past two weeks, I have been solving as many practice problems as I can manage in my spare time leading up to coding bootcamp admissions exams. The two sites I’ve mainly been using are Codewars and Coderbyte.
Codewars is a community-driven site that uses some gimmicky terms (“kata” are code challenges completed to achieve “rank”) to make the challenges feel like a special mission, I guess. The two downsides I found with Codewars were that I had trouble getting around at first (the interface is a little busy) and I had some glitches when I tried to submit my answers. The upside is that the challenges are sorted into eight different levels, so you don’t have to work on problems above or below your ability level.
Overall, I’ve mainly stuck with Coderbyte for its reliability and simplicity, but turned to Codewars for a change of pace, when needed.