Tests · Frontend and markup
Frontend and markup
HTML, CSS, JavaScript, TypeScript and React — the parts an interface is built from, one a business owner edits afterwards rather than a developer.
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Tests in this topic
2 tests at the “Medium” level. Clear the filter to see the whole topic.
Updated August 9, 2026Medium
JavaScript: types, closures and async
Ten situations from working code: loose comparison, a lost this, the order of micro- and macrotasks, errors inside async functions. For people who have already written JavaScript and want to see where intuition parts ways with the spec.
- Questions in the test
- 10 questions
- Time limit
- 10 min
Updated August 9, 2026Medium
React: hooks and state
Ten situations from real work: why a counter adds one instead of two, when an effect stops firing, and what breaks when the key is an index. For people who have written components, not only read the docs.
- Questions in the test
- 10 questions
- Time limit
- 10 min