switchMap()

Function

switchMap<I, R>(switchMapFn: Function): MaybeCancellingPipeOperator<I, ReadReturn<R>, IsCancellingRead<R>>

Maps a value to a different Read using the switchMapFn.

// without cancelling reads
declare const read1: Read<string>;
declare const mappedRead: Read<number>;
const read: Read<number> = read1.pipe(switchMap((value: string) => mappedRead));

// with cancelling source read
declare const read1: Read<string, true>;
declare const mappedRead: Read<number>;
const read: Read<number, true> = read1.pipe(switchMap((value: string) => mappedRead));

// with cancelling mapped read
declare const read1: Read<string>;
declare const mappedRead: Read<number, true>;
const read: Read<number, true> = read1.pipe(switchMap((value: string) => mappedRead));

Observable Behavior:

Works exactly like switchMap of RxJS.

Sync Behavior:

Maps the current value to a new Read using its sync value to continue or cancel the chain.

Source: lib/operators/switch-map.ts:51

Type parameters

Parameter	Description
I	type of the input value
R extends Read<unknown, boolean>	type of the return value

Parameters

Parameter	Type	Description
switchMapFn	(value: I) => R	function used to map the value to a Read

Returns

MaybeCancellingPipeOperator<I, ReadReturn<R>, IsCancellingRead<R>>