Definition
Code review and testing are feedback mechanisms that surface mistakes, share idioms, and make invisible reasoning visible to the learner.
Why it matters
Programming without feedback produces locally functional but globally buggy code; review and tests give the corrections that move learners forward.
Scientific basis
Software-engineering research shows that code review and test-driven development improve both quality and the speed at which developers learn idiomatic patterns.
How to apply it
- Read other people's code and explain in writing why each piece works.
- Write tests before submitting a feature and read the failures carefully.
- Pair with a more experienced developer and ask for specific critique.
Common mistakes
- Treating code review as a chore rather than as a learning opportunity.
- Skipping tests because the code 'works'.
- Dismissing reviewer comments without engaging with the underlying point.
Examples
- A junior developer keeps a log of every code review comment and reviews the log monthly.
- A learner uses property-based testing to find edge cases they did not think of.
Related concepts
- Feedback Loops (is an instance of)
Review and tests are the canonical feedback loops of programming practice. - Calibration (complements)
Tests reveal what you thought worked but actually doesn't.
Where it shows up
Domains: programming, professional-skills. Appears in the Programming & Skill Acquisition cluster alongside 2 other concepts.
Source books
- Make It Stick: Brown, Roediger & McDaniel
- Ultralearning: Scott Young