most-adjunct

Documentation

Note: All functions in most-adjunct are curried.

• concatArray
• fromEagerPromise
• fromFuture
• ignoreElements
• last
• mapError
• range
• switchMap
• tapError
• toArray

concatArray

concatArray(arr: Array<Stream>): Stream

Array variant of most.concat, allowing you to concatenate many streams together.

fromEagerPromise

fromEagerPromise(f(): Promise): Stream

The problem with fromPromise is that promises are eager, and therefore it would have already executed prior to being subscribed to. This function creates a lazy stream version of the promise.

fromFuture

fromFuture(future: Future): Stream

Converts a future into a stream.

ignoreElements

ignoreElements(stream: Stream): Stream

Ignore any further elements. Do not emit any more items in this stream. This does not complete the stream.

last

last(stream: Stream): Stream

Emits only the last item emitted on the stream (once the inner stream has completed).

Example:

const stream = most
  .from([1, 2, 3])
  .thru(mA.last);

stream.observe({
  next: console.log,  
});

// -> 3

a:      -1-2-3-|
stream: -----3-|

mapError

mapError(f: (x): any, stream: Stream): Stream

If the stream errors this function will allow you to transform the error (via mapping) without recovering the error (catching).

This is useful in situations whereby you have an underlying internal error that you want to make into a human readable error.

range

range(start: Number, end: Number): Stream

Create a stream of numbers from start to end.

Example:

const stream = mA.range(1, 3);

stream.observe({
  next: console.log,  
});

// -> 1
// -> 2
// -> 3

switchMap

switchMap(f: (x: any): Stream, stream: Stream): Stream

A composition of map + switchLatest. Will automatically subscribe to the inner stream that is mapped out.

tapError

tapError(f(x: any): void, stream: Stream): Stream

The same as most.tap excepts it allows for tapping of items in the error state.

toArray

toArray(stream: Stream): Stream

Accumlates all of the items emitted and emits an array of all of those items.

None of the original items are emitted on this new stream.

Example:

const stream = most
  .from([1, 2, 3])
  .thru(mA.toArray);

stream.observe({
  next: console.log,  
});

// -> [1, 2, 3]

waitUntil

waitUntil(f: (): boolean | Promise<boolean>, interval: number = 500): Stream

Creates a Stream that will only start emitting events when the predecate function returns true.

Example:

waitUntil(() => returnTrueOrFalse(), 1000)
  .map(() => {});