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Implementing a Queue in Go

Aditya Joshi 69

Implementing a Queue in Go

Aditya Joshi
Level Up Coding
Published in
4 min read16 hours ago


In the world of concurrent programming, data structures like queues play a crucial role in managing and synchronizing data flow. Implementing a queue in Go can be a valuable skill, whether you’re building a multi-threaded application or just need a simple way to manage tasks sequentially. In this article, we’ll explore creating a basic queue in Go.

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Understanding the Queue Data Structure

A queue is a linear data structure that follows the First-In-First-Out (FIFO) principle. This means that the first item added to the queue will be the first one to be removed. Queues are often used for tasks like managing job queues, task scheduling, and handling asynchronous tasks.

Implementing a Queue in Go

Let’s start by creating a simple queue data structure in Go. We’ll use a slice as the underlying data structure for our queue. Here’s a step-by-step guide:

Define the Queue Structure

package main

import "sync"

type Queue struct {
items []interface{}
lock sync.Mutex

In this above snippet, we define a Queue struct with two fields: items to hold the queue elements and lock to manage concurrent access to the queue.

Enqueue — Add an Element to the Queue

To enqueue an element (add it to the end of the queue), we’ll implement the Enqueue method:

func (q *Queue) Enqueue(item interface{}) {
defer q.lock.Unlock()
q.items = append(q.items, item)

This method locks the queue, adds the item to the end of the slice, and then unlocks the queue to allow other operations.

Dequeue — Remove an Element from the Queue

To dequeue an element (remove it from the front of the queue), we’ll implement the Dequeue method:

func (q *Queue) Dequeue() interface{} {
defer q.lock.Unlock()

if len(q.items) == 0 {
return nil // Queue is empty

item := q.items[0]
q.items = q.items[1:]

return item