Function foldR

foldR<T, U>(f: (a: T) => (b: U) => U): (init: U) => (list: List.List<T>) => U
Folds the elements of list from right.

Applying foldR to infinite structures usually doesn't terminate. But it may still terminate under one of the following conditions:
- the folding function is short-circuiting,
- the folding function is lazy on its second argument.
Type Parameters
- T
- U
Parameters
- f: (a: T) => (b: U) => U
  The fold operation.
Returns (init: U) => (list: List.List<T>) => U
The folded value.

Examples
Example
```
expect(
    foldR((x: string) => (y: string) => x + y)("")(fromString("hoge")),
).toStrictEqual(
    "hoge",
);
expect(
    foldR((x: string) => (y: string) => y + x)("")(fromString("")),
).toStrictEqual(
    "",
);
```
- Defined in src/list.ts:791