Run results for: Array vs Linked List App

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/110.0

Browser: Firefox 110

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Linked List	1657.0 Ops/sec
Array	1429.1 Ops/sec

HTML Preparation code:

<ul id="request-list">
</ul>

Script Preparation code:

/**
 * Convenience method to create nodes
 * @param data
 * @param next
 * @return {{data: *, next: *}}
 */
function createNode(data, next) {
  return {
    data: data,
    next
  };
}

/**
 * Determines whether or not the list is empty
 * @param head
 * @return {boolean}
 */
function isEmptyList(head) {
  return head === null;
}

/**
 * Linked List base on code by Nicholas C Zakas. Additional modifications are my own.
 */
function LinkedList() {
    this._size = 0;
    this._head = null;
    this._tail = null;
}

LinkedList.prototype = {
  
    //restore constructor
    constructor: LinkedList,
 
  /**
   * Like its array counterpart, unshift appends an item to the beginning of the list
   * @param data
   */
  unshift: function unshift(data) {
    const node = createNode(data);

    //special case: no items in the list yet
    if (isEmptyList(this._head)) {
      this._head = node;
    } else {
      node.next = this._head;
      this._head = node;
    }
    ++this._size;
  },

  /**
   * Returns the size of the list
   * @return {number}
   */
  size: function size() {
    return this._size;
  },

  /**
   * Applies a function to each item in the list
   * @param fn
   */
  forEach: function forEach(fn) {
    if (this._size > 0) {
      let current = this._head;
      let index = 0;

      while (current) {
        fn(current.data, index, this);
        ++index;
        current = current.next;
      }
    }
  }
}

function domUpdater(requestList) {
  let batch = document.createDocumentFragment();
  const list = document.getElementById("request-list");
  
  requestList.forEach(function(request) {
      const li = document.createElement("li");
      li.dataset.id = request.id;
      li.textContent = request.details;
      batch.appendChild(li);
    });

  list.appendChild(batch);
}

function createRequest(num) {
  return {
    id: num,
    details: "details for: " + num
  };
}

Tests:

Linked List
const requests = new LinkedList(); let count = 500; while(count--) { requests.unshift(createRequest(count)); } domUpdater(requests);
Array
const requests = []; let count = 500; while(count--) { requests.unshift(createRequest(count)); } domUpdater(requests);