Function collSizeN

src/common/coll.ts:7–13

(collSizer: (map: Coll<Child>) => number)

const collSizeN =
  <Child>(collSizer: (map: Coll<Child>) => number) =>
  (coll: Coll<Coll<Child>>): number =>
    arrayReduce<Coll<Child>, number>(
      collValues(coll),
      (total, coll2) => total + collSizer(coll2),
      0,
    );

export const collSize = (coll: Coll<unknown> | undefined): number =>
  coll?.size ?? 0;