Exercism.io is a free, Open Source coding exercise site for leveling up programming skills. They are currently in beta and have over 30 different languages as part of their repertoire.
I am currently using exercism.io for two reasons:
- To mentally cement the syntax differences between different languages that I have studied
- To participate in a WeAllJS's #learning community
Currently I am following the tracks for:
- JavaScript
- PHP
- Python