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Data Structures for Coding Interviews in JavaScript

Challenge: Implement Queue Using Stacks

Explore how to implement a queue using only two stack data structures by designing enqueue and dequeue methods. This lesson helps you understand the relationship between stacks and queues while practicing practical coding challenges in JavaScript.

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Statement

Design a queue data structure using only two stacks and implement the following functions:

  • enqueue(int x): Inserts a value to the back of the queue.
  • dequeue(): Removes and returns the value from the front of the queue.

Constraints:

  • −105≤-10^5 \leq x ≤105\leq 10^5

Examples

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Try it yourself

Implement your solution in the following coding playground.

Note: You may use the custom MyStack class provided in the code to simulate a stack.

JavaScript
usercode > index.js
import Stack from './Stack.js';
//Create Stack => stack = Stack(); 
//Push Function => stack.push() 
//Pop Function => stack.pop()       
//Top Function => stack.getTop()  
//Helper Functions => stack.isEmpty() //returns boolean
class newQueue {
    constructor() {
        // Write your code here
    }
    enqueue(value) {
        // Write your code here
    }
    dequeue() {
        // Replace this placeholder return statement with your code
        return;
    }
}
export {
    newQueue
};
Implement Queue Using Stacks