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Data Structures for Coding Interviews in JavaScript

Challenge: Reverse First k Elements of Queue

Explore how to reverse the first k elements of a queue in JavaScript while handling edge cases like invalid k values and empty queues. This lesson helps you implement queue manipulation with clear constraints, deepening your understanding of stack and queue operations for coding interviews.

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Statement

Given a queue and a number k, reverse the order of the first k elements in queue. If k is less than 00, if k exceeds queue size, or if queue is empty, return NULL. Otherwise, return the modified queue.

Constraints:

  • 0≤0 \leq queue.length ≤103\leq 10^{3}
  • 10−3≤10^{-3} \leq queue[i] ≤103\leq 10^{3}
  • 10−3≤10^{-3} \leq k ≤103\leq 10^{3}

Examples

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Try it yourself

Implement your solution in the following coding playground.

JavaScript
usercode > index.js
import Stack from './Stack.js';
function reverseK(queue, k) {
    // Replace this placeholder return statement with your code
    return queue;
}
export {
    reverseK
};
Reverse First k Elements of Queue