Method peekFront

data_structures/deque.ts:434–437

* Return the front element without removing it, or `undefined` if the deque * is empty. * * @example Peeking at the front * ```ts * import { Deque } from "@std/data-structures/deque"; * import { assertEquals } from "@std/assert"; * * const deque = new Deque([1, 2, 3]); * a

()

   * @returns The front element, or `undefined` if empty.
   */
  peekFront(): T | undefined {
    if (this.#length === 0) return undefined;
    return this.#buffer[this.#head];
  }

  /**
   * Return the back element without removing it, or `undefined` if the deque