Question bank

Every question is one file, one Agent Skill and one measurable outcome. Coding questions run in the browser against the same tests the build runs under Node, so "it passes" means the same thing here, in CI, and to an agent working on your repository.

Question bank 0 of 0 done (0%)

Search Format All formats Quiz Coding UI coding System design Agent harness Difficulty Any difficulty Easy Medium Hard Layer All layers UI Server State Topic All topicsaccessibilityactionsajaxapiapp-shellatomatomic-designattributesauthenticationcomponentcontainercruddomeventsimagesindex-filelinkslocalizationmfemiddlewaremoleculeoperationsorganismpagepropsprotocolproxyreducerrouterrwdselectorsseosessionskeletonssgssrstatestorestorythemewidget

47 questions

• Mark Build an accessible combobox done Build an accessible combobox ui-coding hard ui 45 min
• Mark Implement Redux-style action creators done Implement Redux-style action creators coding easy state 15 min
• Mark Apply Middleware to a Store's Dispatch done Apply Middleware to a Store's Dispatch coding medium state 20 min
• Mark Where does an atom stop? done Where does an atom stop? quiz easy ui 8 min
• Mark Design the caching layer for a static app done Design the caching layer for a static app system-design easy server 20 min
• Mark Combine Reducers done Combine Reducers coding medium state 20 min
• Mark Build a Counter component done Build a Counter component coding easy ui 25 min
• Mark Implement a Redux-style reducer with immutability done Implement a Redux-style reducer with immutability coding medium state 20 min
• Mark Make a data table sortable done Make a data table sortable ui-coding hard ui 45 min
• Mark Create a debounce utility done Create a debounce utility coding medium ui 15 min
• Mark Deep clone a value done Deep clone a value coding medium state 30 min
• Mark Design an embeddable widget done Design an embeddable widget system-design hard server 45 min
• Mark Design a localized application done Design a localized application system-design easy server 25 min
• Mark Split a monolith into micro-frontends done Split a monolith into micro-frontends system-design hard server 50 min
• Mark Design a search-as-you-type experience done Design a search-as-you-type experience system-design medium server 35 min
• Mark How to delegate events in the DOM done How to delegate events in the DOM quiz easy ui 7 min
• Mark Build an event emitter done Build an event emitter coding medium ui 25 min
• Mark Build an accessible form field done Build an accessible form field ui-coding medium ui 30 min
• Mark Gate a pull request on accessibility done Gate a pull request on accessibility harness hard ui 50 min
• Mark Write a guardrail for the ui-atom skill done Write a guardrail for the ui-atom skill harness medium ui 40 min
• Mark Guardrail a performance budget done Guardrail a performance budget harness medium server 35 min
• Mark Guardrail a docs site's links done Guardrail a docs site's links harness easy server 25 min
• Mark Write an eval set for an Agent Skill done Write an eval set for an Agent Skill harness hard state 55 min
• Mark Guardrail a store's shape done Guardrail a store's shape harness hard state 50 min
• Mark Build an infinite-scroll list done Build an infinite-scroll list ui-coding hard ui 45 min
• Mark Build a loading Button atom done Build a loading Button atom ui-coding easy ui 30 min
• Mark Memoize a derived selector done Memoize a derived selector coding medium state 25 min
• Mark What order does middleware run in? done What order does middleware run in? quiz medium state 10 min
• Mark Normalise a nested API response done Normalise a nested API response coding hard state 35 min
• Mark Design an offline-first task list done Design an offline-first task list system-design medium state 35 min
• Mark Presentational vs container components done Presentational vs container components quiz easy ui 5 min
• Mark Setting Default Values for Props done Setting Default Values for Props quiz easy ui 7 min
• Mark Proxy it or fix CORS? done Proxy it or fix CORS? quiz medium server 10 min
• Mark Round-trip filter state through the URL done Round-trip filter state through the URL coding medium server 25 min
• Mark Event Propagation Phases done Event Propagation Phases quiz medium ui 8 min
• Mark Pick a rendering strategy done Pick a rendering strategy quiz medium server 10 min
• Mark Ship a responsive image the browser can choose done Ship a responsive image the browser can choose ui-coding medium server 30 min
• Mark Retry a request with backoff done Retry a request with backoff coding hard state 35 min
• Mark Selector Memoization Basics done Selector Memoization Basics quiz medium state 10 min
• Mark Where does the session actually live? done Where does the session actually live? quiz hard server 12 min
• Mark Create a Redux-like store done Create a Redux-like store coding medium state 20 min
• Mark Replace a spinner with a skeleton done Replace a spinner with a skeleton ui-coding easy ui 25 min
• Mark Build a tabs molecule the arrow keys drive done Build a tabs molecule the arrow keys drive ui-coding medium ui 35 min
• Mark Build a theme toggle with no flash done Build a theme toggle with no flash ui-coding easy ui 25 min
• Mark Build a toast notification stack done Build a toast notification stack ui-coding medium ui 40 min
• Mark Handling DOM Events done Handling DOM Events quiz easy ui 8 min
• Mark Validating Prop Usage done Validating Prop Usage quiz easy ui 7 min