Implementation of queue using deque class

Let's go ahead and utilize a queue along with its operations in python language using the deque class!

The deque class is imported from the collections module. We use append() function to add elements to the queue and popleft() function to remove elements from the queue.

We can see that after enqueuing, our initial queue looks like this:

1Initial queue:
2deque(['a', 'b', 'c', 'd'])

And after dequeuing, our final queue looks something like this:

1Final queue
2deque(['d'])

You can find more functions on deque collections here.

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// JavaScript program to demonstrate queue implementation using Array

​

let q = [];

​

// Adding/Enqueueing elements to a queue

q.push('a');

q.push('b');

q.push('c');

q.push('d');

​

console.log("Initial queue:");

console.log(q);

​

// Removing/Dequeuing elements from a queue

console.log("\nElements dequeued from the queue:");

console.log(q.shift());

console.log(q.shift());

console.log(q.shift());

​

console.log("\nFinal queue");

console.log(q);