Developer skills guides
Short, practical guides for the reasoning skills that matter when you need to inspect code without handing the whole problem to a tool. Each guide starts with a direct answer, then gives you a small practice loop to try.
Public code review lab
Practice three small JavaScript, Python and TypeScript code reviews. Predict the behavior, inspect a repair and run the original public teaching examples.
Read the guidePublic code review lab
Trace an off-by-one retry loop, test the zero and three-attempt boundaries, and review a minimal JavaScript repair.
Read the guidePublic code review lab
Review a validation pass that exhausts a generator, then compare a one-pass Python repair using executable counterexamples.
Read the guidePublic code review lab
Test a boolean default with false and an omitted field, then use nullish coalescing to preserve an explicit user choice.
Read the guideFoundation guide
Unassisted coding means solving a task without AI, autocomplete, or external answers for a defined period. Learn what it measures and how to use it.
Read the guideSkill guide
Code recall is the ability to reconstruct small pieces of code from memory. Learn what to practice, what not to memorize, and how to test it.
Read the guideSkill guide
Learn code tracing with a worked JavaScript loop, step-by-step state tables, an array-alias example, and a free reasoning check.
Read the guideSkill guide
A practical debugging loop for developers who want to reason through a failure before asking an AI assistant or search engine for a fix.
Read the guideSkill guide
Learn how to compare implementation with intent, find mismatched assumptions, and catch bugs that clean-looking code can hide.
Read the guideSkill guide
Compare idiomatic Python, JavaScript and TypeScript with tested before-and-after examples. Learn the tradeoffs and try a short review exercise.
Read the guideSkill guide
Review a JavaScript bug that mishandles zero, compare the corrected code and boundary tests, and learn how to verify AI-generated changes against a contract.
Read the guideReliability guide
Review retry logic by checking retryable failures, idempotency, attempt budgets, backoff, jitter, and the outcome a caller sees when retries stop.
Read the guideSecurity review guide
Review access-control changes by mapping the subject, action, resource, context, enforcement point, and denied-path evidence before approval.
Read the guideComparison guide
Compare algorithm puzzle platforms like LeetCode with Unrust's unassisted code reading, tracing, debugging, and diff review drills.
Read the guideComparison guide
Understand the difference between employer screening assessments like HackerRank and personal, low-friction unassisted debugging and code-tracing practice on Unrust.
Read the guideComparison guide
Compare Exercism's mentored, untimed language implementation tracks with Unrust's fast diagnostic snapshots and execution-traced debugging and code-review practice.
Read the guideComparison guide
Compare solving community algorithm kata on Codewars with practicing execution-traced code reading, state debugging, and diff review on Unrust.
Read the guideComparison guide
Learn when static Anki flashcards work well for API memorization and when variant-rotated, execution-traced coding drills on Unrust prevent card-surface memorization.
Read the guideWorkspace debugging guide
Learn a structured method for tracing contracts, data shapes, and state mutations across module boundaries when a bug spans multiple files.
Read the guideWorkspace debugging guide
Learn how to separate the first loud ERROR symptom from the earlier root-cause event when reading interleaved async production logs.
Read the guideWorkspace debugging guide
Learn how to review SQL queries by tracing intermediate row sets through JOIN, WHERE, GROUP BY, and NULL-sensitive aggregates before checking the final SELECT.
Read the guideAI code review guide
Learn a step-by-step review checklist for auditing multi-file edits generated by agentic coding tools like Cursor, Claude Code, and GitHub Copilot.
Read the guideReliability guide
Learn how to review async/await control flow, concurrent Promise.all vs Promise.allSettled behavior, and unawaited floating promises in JavaScript and TypeScript.
Read the guideTypeScript review guide
Learn how to spot unsafe type assertions (as), truthiness narrowing bugs, and unvalidated JSON payloads at TypeScript runtime boundaries.
Read the guideChoose the right tool for the job
Algorithm platforms, language tracks, and flashcards each solve a different problem. Compare how they fit alongside unassisted code reading and debugging practice.
LeetCode
Unrust
Browse focused pages for common coding situations, or choose a supported language for skill-specific practice. Each resource is practice material, not an explanation for why a diagnostic result occurred.
Try an example in the free coding tools, or read a worked walkthrough on the Unrust blog.
The free Unrust diagnostic uses short, timed drills to give you a per-skill snapshot. It is a starting point for practice, not a verdict about why a result happened.
Take the free diagnostic