Function pickBy

src/util/misc/pick.ts:19–29

(
  source: T,
  predicate: <K extends keyof T>(value: T[K], key: K, collection: T) => boolean
)

};

export const pickBy = <T extends Record<string, any>>(
  source: T,
  predicate: <K extends keyof T>(value: T[K], key: K, collection: T) => boolean
) => {
  return (Object.keys(source) as (keyof T)[]).reduce((o, key) => {
    if (predicate(source[key], key, source)) {
      o[key] = source[key];
    }
    return o;
  }, {} as Partial<T>);
};