Method append

lib/internal/timers.js:297–305

(item)

  // Appends an item to the end of the linked list, adjusting the current tail's
  // next pointer and the item's previous pointer where applicable
  append(item) {
    if (this.tail !== null) {
      this.tail._idleNext = item;
      item._idlePrev = this.tail;
    } else {
      this.head = item;
    }
    this.tail = item;
  }

  // Removes an item from the linked list, adjusting the pointers of adjacent
  // items and the linked list's head or tail pointers as necessary