Function groupSort

external/.d3.js:580–585

(values, reduce, key)

}

function groupSort(values, reduce, key) {
  return (reduce.length !== 2
    ? sort(rollup(values, reduce, key), (([ak, av], [bk, bv]) => ascending$3(av, bv) || ascending$3(ak, bk)))
    : sort(group(values, key), (([ak, av], [bk, bv]) => reduce(av, bv) || ascending$3(ak, bk))))
    .map(([key]) => key);
}

var array$5 = Array.prototype;