Stacks And Queues

Queue Operations

Visualize FIFO behavior with enqueue, dequeue, and peek operations before moving into sliding window and scheduling patterns.

OperationO(1)

FIFO: first in, first outoperation: peekactive value: 12

FrontRear

value12

value24

value36

value48

Time

O(1)

Space

O(n)

Step Note

Peek reads the front queue item without removing it.

function peek(queue: number[]) {
  if (queue.length === 0) return null
  return queue[0]
}