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FIFO

FIFO (First In, First Out) is a principle used to manage items in a collection where the first item added to the collection is the first one to be removed. This concept is commonly applied to data structures like queues, where elements are stored and retrieved in the order they were added.

When applied to lists, FIFO means that elements are appended to the end of the list and removed from the beginning. This ensures that the oldest elements in the list are processed or accessed first.

FIFO lists are useful for scenarios where processing order matters, such as task scheduling, message queues, or buffering data streams. They provide a straightforward and predictable way to manage and access items based on their arrival order.

Let’s consider a real-life example of FIFO in the context of a queue at a ticket counter.

Imagine you’re at a movie theater, and there’s a queue (FIFO) at the ticket counter. Here’s how it works:

  1. Arrival: As people arrive at the movie theater, they join the queue in the order they arrive. The first person to arrive is at the front of the queue, and each subsequent person joins the line behind them.

  2. Ticket Purchase: When the ticket counter is ready to serve the next customer, the cashier helps the person at the front of the queue. This person purchases their ticket and leaves the queue.

  3. Processing Order: The cashier serves each customer in the order they joined the queue. This ensures fairness and that everyone is served in the order they arrived.

  4. Departure: After purchasing their ticket, each customer leaves the queue and enters the theater to enjoy the movie. The queue gradually decreases in size as customers are served.

  5. Empty Queue: If there are no more customers in the queue, the ticket counter remains idle until the next person arrives to join the queue.

This example demonstrates how FIFO (First In, First Out) is naturally observed in everyday situations, such as waiting in line at a ticket counter. The first person to arrive (join the queue) is the first one to be served (leave the queue), ensuring fairness and orderly processing.

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