JS Practice — Built-in Objects

Implement a Queue with unshift

📖 Usage Example

const queue = ['second', 'third']
queue.unshift('first')
queue.shift()  // → 'first'  (FIFO)

Use unshift() with shift() to manage a FIFO queue by adding to the front and removing from it.

Array.prototype.unshift — Queue

Using unshift to prepend and pop to dequeue from the end gives you a simple FIFO queue.

Implement enqueue which prepends val using unshift and returns the modified queue.

💡 Hints (2)