Method ordering

src/base/base-mixin.js:360–367

* Get or set an accessor to order ordinal dimensions. The chart uses * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort Array.sort * to sort elements; this accessor returns the value to order on. * @example * // Default ordering

(orderFunction)

     * @returns {Function|BaseMixin}
     */
    ordering (orderFunction) {
        if (!arguments.length) {
            return this._ordering;
        }
        this._ordering = orderFunction;
        this.expireCache();
        return this;
    }

    _computeOrderedGroups (data) {
        // clone the array before sorting, otherwise Array.sort sorts in-place