asyncMap

The asyncMap() function transforms each element of a generator by applying an asynchronous transformation function. It returns an asynchronous generator with the transformed values.

Interactive example

Syntax

Classic signature

function asyncMap<
	const GenericInput extends unknown,
	const GenericOutput extends unknown,
>(
	iterator: AsyncIterable<GenericInput> | Iterable<GenericInput>,
	theFunction: (arg: GenericInput, params: AsyncGeneratorMapParams) => Promise<GenericOutput>
): AsyncGenerator<GenericOutput, unknown, unknown>

Curried signature

function asyncMap<
	const GenericInput extends unknown,
	const GenericOutput extends unknown,
>(
	theFunction: (arg: GenericInput, params: AsyncGeneratorMapParams) => Promise<GenericOutput>
): (iterator: AsyncIterable<GenericInput> | Iterable<GenericInput>) => AsyncGenerator<GenericOutput, unknown, unknown>

Parameters

• iterator: The generator (synchronous or asynchronous) to transform
• theFunction: Asynchronous transformation function that receives:
  • arg: The current element
  • params.index: The element index

Return value

An AsyncGenerator emitting the transformed values.

See also

• map - Synchronous version of asyncMap
• asyncFilter - Filters with an async function
• asyncReduce - Reduces with an async function

Sources

• MDN Web Docs - Async iterators