I found this site a few months ago – codewars.com – and having mentioned it to a few friends of mine it seems not everyone in my social circle has heard of it.  It’s a great site that gives you programming problems to solve, and supports a variety of programming languages.

I’ve mostly been using it to keep up my javascript skills during the house build.  There are a ton of interesting problems and you can learn all sorts of different means to solve them, I’ve found it really useful and highly recommend it to other developers.  They make it more interesting by turning it into a bit of a game, where you “rank up” the more problems you solve (and at higher ranks, you get harder/trickier problems to solve).  Really enjoyable way to start the day with the morning coffee!