Darkhogg/polyethylene

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[Home](./index.md) &gt; [polyethylene](./polyethylene.md) &gt; [AsyncIndexedReducer](./polyethylene.asyncindexedreducer.md)

## AsyncIndexedReducer type

A function that receives an accumulated result, an element of an iteration, and returns a new accumulated result or a promise to a new accumulated result for the next call or as a final return value.

<b>Signature:</b>

```typescript
export declare type AsyncIndexedReducer<T, U> = (acc: U, item: T, index: number) => U | PromiseLike<U>;
```