Method group

src/base/base-mixin.js:340–348

* **mandatory** * * Set or get the group attribute of a chart. In `dc` a group is a * https://github.com/crossfilter/crossfilter/wiki/API-Reference#group-map-reduce crossfilter group. * Usually the group should be created from the particular dimension associated with the

(group, name)

     * @returns {crossfilter.group|BaseMixin}
     */
    group (group, name) {
        if (!arguments.length) {
            return this._group;
        }
        this._group = group;
        this._groupName = name;
        this.expireCache();
        return this;
    }

    /**
     * Get or set an accessor to order ordinal dimensions.  The chart uses