Function reduce

reduce<T, R>(
reduction: (result: R, value: T, index: number) => R | Promise<R>,
initial: R | Promise<R>,
): (values: AsyncIterable<T>) => Promise<R>
Creates a consumer that reduces values from an async iterable to a single result.
Type Parameters
- T
- R
Parameters
- reduction: (result: R, value: T, index: number) => R | Promise<R>
  Function that takes the accumulated result, the current value, and the index, and returns the new accumulated result
- initial: R | Promise<R>
  The initial value for the reduction
Returns (values: AsyncIterable<T>) => Promise<R>
A consumer function that returns a promise resolving to the final reduced value
Description
Processes each value in the async iterable using the provided reduction function, accumulating a result starting with the initial value.
Example
```
const sum = await G.pipe(
  G.ofIterable([1, 2, 3, 4, 5]),
  G.reduce((acc, value) => acc + value, 0)
); // sum === 15
```
- Defined in reduce.ts:20