Method add

lib/util/SortableSet.js:54–60

* Returns itself. * @param {T} value value to add to set * @returns {this} returns itself

(value)

	 * @returns {this} returns itself
	 */
	add(value) {
		this._lastActiveSortFn = NONE;
		this._invalidateCache();
		this._invalidateOrderedCache();
		super.add(value);
		return this;
	}

	/**
	 * Returns true if value existed in set, false otherwise.