For those of you who like solving coding challenges online either for fun, practice, or to prepare for interviews, here's a list of popular sites:

https://medium.freecodecamp.org/the-10-most-popular-coding-c...

I also recently put this list of resources together about Algorithms practice which I think can help out anyone who's preparing for an interview soon:

https://medium.com/coderbyte/how-to-get-good-at-algorithms-d...