Function findOrAddLabel

src/scales/scale.category.js:14–21

(labels, raw, index, addedLabels)

};

function findOrAddLabel(labels, raw, index, addedLabels) {
  const first = labels.indexOf(raw);
  if (first === -1) {
    return addIfString(labels, raw, index, addedLabels);
  }
  const last = labels.lastIndexOf(raw);
  return first !== last ? index : first;
}

const validIndex = (index, max) => index === null ? null : _limitValue(Math.round(index), 0, max);