Method at

lib/array-set.js:84–89

* What is the element at the given index? * * @param Number aIdx

(aIdx)

   * @param Number aIdx
   */
  at(aIdx) {
    if (aIdx >= 0 && aIdx < this._array.length) {
      return this._array[aIdx];
    }
    throw new Error("No element indexed by " + aIdx);
  }

  /**
   * Returns the array representation of this set (which has the proper indices