Type Alias Mapper<Element, NewElement>

Mapper: (element: Element, index: number) => NewElement | Promise<NewElement>

Function which is called for every item in input. Expected to return a Promise or value.

Type Parameters

Element = unknown
Source element type
NewElement = unknown
Element type returned by the mapper

Type Declaration

- (element: Element, index: number): NewElement | Promise<NewElement>
- Parameters
  - element: Element
    Iterated element
  - index: number
    Zero-based index of the input element
  Returns NewElement | Promise<NewElement>