Function onAdd

stories/Pie.stories.tsx:34–36

()

export const Dynamic = args => {
  const [datasets, setDatasets] = useState(() => [randomDataset()]);
  const onAdd = () => {
    setDatasets(datasets => [...datasets, randomDataset()]);
  };
  const onRemove = () => {
    setDatasets(datasets => datasets.slice(0, -1));
  };