Previous Daily Questions
All daily questions that have been asked in the past.
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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