What is a Queue? Explain FIFO.

Difficulty: 4/10

FIFO, Producer-Consumer, Buffer Management

Queue and FIFO

A Queue is a linear data structure that follows FIFO: First In, First Out. The element that enters first is the first element removed. A typical queue inserts at the rear and removes from the front.

javascript

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FIFO ensures elements are processed in arrival order.
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Enqueue adds an element at the rear.
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Dequeue removes an element from the front.
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A properly implemented queue supports enqueue and dequeue in O(1).
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Queues are common in scheduling, messaging, buffering, and breadth-first search.

Scenario Questions

0-2 years experience

Follow-up Questions