Function reduce

reduce<T, U>(
    this: Set<T>,
    reducer: (accum: U, element: T, index: number, set: Set<T>) => U,
    initial?: U,
): U
Create a new value with elements that are filtered and transformed by a provided reducer function.
Type Parameters
- T
- U
Parameters
- this: Set<T>
- reducer: (accum: U, element: T, index: number, set: Set<T>) => U
  A reducer function applied to each value.
- Optionalinitial: U
  The initial value of the returned accumulator.
Returns U
The final value of the accumulator.

See
Array#reduce