Function keyBy

frontend/src/utils/collections.ts:14–20

(array: T[], keyOf: (item: T) => K)

};

export const keyBy = <T, K>(array: T[], keyOf: (item: T) => K): Map<K, T> => {
  return array.reduce((map, item) => {
    const key = keyOf(item);
    map.set(key, item);
    return map;
  }, new Map<K, T>());
};

export const upsertArray = <T>(array: T[], item: T) => {
  const index = array.indexOf(item);