Method _updateMetasets

src/core/core.controller.js:385–398

* @private

()

	 * @private
	 */
  _updateMetasets() {
    const metasets = this._metasets;
    const numData = this.data.datasets.length;
    const numMeta = metasets.length;

    metasets.sort((a, b) => a.index - b.index);
    if (numMeta > numData) {
      for (let i = numData; i < numMeta; ++i) {
        this._destroyDatasetMeta(i);
      }
      metasets.splice(numData, numMeta - numData);
    }
    this._sortedMetasets = metasets.slice(0).sort(compare2Level('order', 'index'));
  }

  /**
	 * @private