Type alias MapContext<T>

MapContext<T>: {
    array: readonly T[];
    assertNoFailure: (() => void);
    failed?: boolean;
}

context from xaa.map to the mapper callback

array: readonly T[]
the original array that's passed to xaa.map
assertNoFailure: (() => void)
During concurrent map, if any mapper failed, this allow other inflight map functions to assert that no failure has occurred, else stop.
- - (): void
  - Returns void
Optional failed?: boolean
indicate if another map operation during concurrent map has failed Mapping should observe this flag whenever possible and avoid continuing if it makes sense.