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You're building a task queue that processes items in batches. What will be the final state of the processed array?

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Async programmingPromisesArrays+1

Medium2025-01-18

In a web analytics tool, you need to track user interactions. What will be logged after these interactions are processed?

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Event trackingArraysReduce+1

Hard2025-01-17

You're debugging an array manipulation utility. What will be the final result of this array transformation?

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ArraysFilterMap+2

Medium2025-01-16

Working on a notification system, you need to format user messages. What will be the output of this formatting utility?

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String manipulationDate formattingStatic methods

Easy2025-01-15

While optimizing a web application's performance, you need to implement request batching. What will be logged after processing these requests?

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Async programmingQueuesBatching+1

Hard2025-01-14

Your team's data visualization dashboard needs to process time series data. What will be the final transformed output of this data processor?

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AlgorithmsData processingStatic methods

Hard2025-01-13

Your e-commerce platform needs to calculate discounts based on multiple promotions. What total price would a customer pay for their cart using this promotion calculator?

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Class methodsJavascript

Medium2025-01-12

During a client meeting, your team discovers the authentication system isn't properly handling token expiration. What would be the output when testing this token validator?

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AuthenticationTimingClosures+1

Easy2025-01-11

You're debugging a shopping cart implementation where prices are acting strangely. What surprising behavior might occur with this code?

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Object referencesMapsMutability

Medium2025-01-10

In a real-time chat application, you need to implement rate limiting for message sending. What will be the maximum number of messages a user can send in any 5-second window using this implementation?

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Rate limitingAsync programmingQueues+1

Hard2025-01-09

Your team is troubleshooting a memory leak in a long-running application. Hidden in this event subscription module is a common mistake that can lead to memory leaks. Can you spot the issue?

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Memory managementWeak referencesEvent handling+1

Medium2025-01-08

You're building a caching system for an e-commerce platform that needs to store product data but automatically expire old entries. What will be the output of the following code when run?

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CachingTimersMap+2

Hard2025-01-07

A startup is building a user engagement tracking system. When users hover over different UI elements, you need to track the total time they spend on each element. What's wrong with this implementation?

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ClosuresState management

Medium2025-01-06

You're developing a custom state management solution for a complex web application. The system needs to track state changes and allow for time-travel debugging. What will be the final state after executing the following code?

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State managementReducersImmutability

Hard2025-01-05

You are tasked with finding the most common element in an array. Which of the following code snippets correctly accomplishes this?

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ArraysReduceAggregation

Hard2025-01-04

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