#30DaysOfDebugging

30 Days of Debugging

One real bug a day for 30 days. Fix it in your browser, watch your progress fill in, and claim a free certificate at the end. Pick the language you are learning.

• PythonIndex errors, None, strings and lists first, then boundaries, rounding and an interview problem.Start the Python path →
• JavaScriptundefined, array bounds and type coercion first, then dates, closures and async code.Start the JavaScript path →