Bug Hunt 🐞

Learn to debug like a professional

Developers spend more time reading and fixing code than writing it. Spotting a bug quickly is a real skill, and it comes from knowing the common mistakes. Bug Hunt trains you on the ones we see most often in real projects:

• Off-by-one errors: loops that run one time too many or too few.
• Wrong starting values: such as starting a maximum at 0.
• = vs ===: assigning when you meant to compare.
• Missing await: using a Promise as if it were the data.
• Object equality: two objects that look the same are not equal.
• Closures and this: var in loops, and functions that lose this.

Each level is short and has exactly one bug, so you can practise in a few minutes a day.