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Code Labs · Practice index

JavaScript Coding

Build interview fluency through focused coding challenges, from core language mechanics to browser-ready patterns.

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Suggested next challenge4. Improve a function

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Challenge index

46 challenges

StatusChallengeDifficultyAsked at

4. Improve a functionPROMedium 5. ThrottleMedium

13. Deep CloneMedium 14. Event EmitterPROMedium 66. Promise MethodsPROEasy 19. Memoize IEasy

86. API RetryPROMedium Polyfill: call( )PROMedium mul(a)(b)(c)Easy sum(a)(b)(c).....(n)Medium Flatten ArrayEasy Polyfill: map( )Easy City Fetcher APIPROEasy promise.all( )PROHard promise.allSettled( )PROHard promise.any( )PROHard promise.race( )PROHard Reverse Words in a StringEasy promise.reject()Easy composeAsyncPROMedium Sequential AsyncPROMedium Debounce IIPROMedium Promise MergePROMedium ChunkPROEasy Polyfill: Array.prototype.reduceEasy

ByteDance

JSON.stringify (Basic)Medium JSON.stringify II (Advanced)PROHard React Hook: useTimeoutPROMedium FillPROEasy Build a Resilient Test RunnerHard Camel Case KeysPROMedium Backbone ModelPROHard MiddlewaresPROMedium Deep Clone IIPROHard Cancellable TimeoutPROEasy HTML SanitizerPROMedium Promise PoolPROHard Retry Promise with Exponential BackoffPROMedium Memoize Async FunctionPROHard Abortable PromisePROMedium Task Scheduler with PriorityPROHard Promise.any PolyfillPROMedium Throttle with Leading and TrailingPROHard Get and Set by PathPROMedium Event Emitter with OncePROMedium Model API Request States with TypeScriptMedium

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