es-grid-template/es/ali-table/utils/groupBy2.js

es-grid-template

export default function groupBy2(list, iteratee) {
  const groups = new Map();
  for (const item of list) {
    const key = iteratee(item);
    if (!groups.has(key)) {
      groups.set(key, []);
    }
    // @ts-ignore
    groups.get(key).push(item);
  }
  return groups;
}