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Common code and interview problems solved in multiple languages

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Code Problems

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This is an incomplete repo full of code problems used prior to or during an interview. I hope these problems will be useful for you to practice and review. If you have practiced on or designed an interesting problem, we'd love to see it! Open a PR or issue with your suggestions or optimizations.


View all problems, or start here:

Sorting Algorithms

Data Structures

DOM Problems

Shortest Code Problems


npm install # Installs `mocha` and any other dependencies needed to run
npm test    # Runs the testing scripts


If you have a problem or solution that's not currently not included, please open an issue or pull request! If you're including new content, please make sure you have permission to publish the content you are adding. Under no circumstance should you copy problems online without a visible license or attribution, or from coding interview websites such as Codility.

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