sort.js
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sort.js
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	import {Selection} from "./index.js";

	export default function(compare) {
	if (!compare) compare = ascending;

	function compareNode(a, b) {
	return a && b ? compare(a.__data__, b.__data__) : !a - !b;
	}

	for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {
	for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {
	if (node = group[i]) {
	sortgroup[i] = node;
	}
	}
	sortgroup.sort(compareNode);
	}

	return new Selection(sortgroups, this._parents).order();
	}

	function ascending(a, b) {
	return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
	}