Skip to content
This repository has been archived by the owner before Nov 9, 2022. It is now read-only.
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
Go to file
Cannot retrieve contributors at this time

This is RxJS v 4. Find the latest version here

Rx.Observable.prototype.shareReplay([bufferSize], [window], [scheduler])

Returns an observable sequence that shares a single subscription to the underlying sequence replaying notifications subject to a maximum time length for the replay buffer.

This operator is a specialization of replay that connects to the connectable observable sequence when the number of observers goes from zero to one, and disconnects when there are no more observers.


  1. [bufferSize] (Number): Maximum element count of the replay buffer.
  2. [window] (Number): Maximum time length of the replay buffer in milliseconds.
  3. [scheduler] (Scheduler): Scheduler where connected observers within the selector function will be invoked on.


(Observable): An observable sequence that contains the elements of a sequence produced by multicasting the source sequence within a selector function.


var interval = Rx.Observable.interval(1000);

var source = interval
    .doAction(function (x) {
        console.log('Side effect');

var published = source


// Creating a third subscription after the previous two subscriptions have
// completed. Notice that no side effects result from this subscription,
// because the notifications are cached and replayed.

function createObserver(tag) {
    return Rx.Observer.create(
        function (x) {
            console.log('Next: ' + tag + x);
        function (err) {
            console.log('Error: ' + err);
        function () {

// => Side effect
// => Next: SourceA0
// => Next: SourceB0
// => Side effect
// => Next: SourceA1
// => Next: SourceB1
// => Side effect
// => Next: SourceA2
// => Next: SourceB2
// => Side effect
// => Next: SourceA3
// => Next: SourceB3
// => Completed
// => Completed
// => Next: SourceC1
// => Next: SourceC2
// => Next: SourceC3
// => Completed





NPM Packages:

NuGet Packages:

Unit Tests: