06. * Sorted List

function sortedList() {
  const list = (function () {
    const collection = [];

    const collectionProcessor = {
      add(element) {
        collection.push(element);
        collection.sort(ascendingOrder);
        this.size++;
        return collection;
      },
      remove(index) {
        if (isValidIndex(index)) {
          collection.splice(index, 1);
          this.size--;
          return collection;
        }
      },
      get(index) {
        if (isValidIndex(index)) {
          return collection[index];
        }
      },
      size: 0,
    };
    return collectionProcessor;

    function ascendingOrder(a, b) {
      return a - b;
    }

    function isValidIndex(index) {
      return index >= 0 && index < collection.length;
    }
  }());
  return list;
}