IxJS | The Interactive Extensions for JavaScript | Reactive Programming library
kandi X-RAY | IxJS Summary
kandi X-RAY | IxJS Summary
The Interactive Extensions for JavaScript (IxJS) is a library for creating and composing asynchronous sequences using both the Iterable and AsyncIterable classes. The Iterable class a way to create and compose synchronous collections much like Arrays, Maps and Sets in JavaScript using the Array#extras style using the familiar methods you are used to like map, filter, reduce and more. The Iterable class implements the iterator pattern in JavaScript by exposing the [Symbol.iterator] method which in turn exposes the Iterator class. The iterator yields values by calling the next() method which returns the IteratorResult class. The AsyncIterator class is based off the ECMAScript Proposal for Asynchronous Iterators. This would allow us to create asynchronous collections of Promises and be able to use such methods as the map, filter, reduce and other Array#extras methods that you are used to using. The AsyncIterable class implements the async iterator pattern in JavaScript by exposing the [Symbol.asyncIterator] method which in turn exposes the AsyncIterator class. The iterator yields values by calling the next() method which returns a Promise which resolves a IteratorResult class.
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QUESTION
What's the difference between RxJS and IxJS, and when would I want to use one over the other?
From the IxJS docs:
RxJS is great for event-based workflows where the data can be pushed at the rate of the producer, however, IxJS is great at I/O operations where you as the consumer can pull the data when you are ready.
After going through the docs, the only major difference seems to be the concept of Iterables in IxJS and Observables in RxJS.
Both Iterables and Observables execute either synchronously or asynchronously, and the .forEach from IxJS is essentially the same as RxJS's .subscribe method when paired with the almost-identical from creator function. The only other difference is IxJS's .forEach method is optional because you could use the imperative for-of instead.
It seems like there are two libraries for no reason because RxJS's from creator function can convert Iterables to Observables.
From my perspective, it's not really IxJS and RxJS, it's Iterables and Observables. How are they different and when would you use one over the other?
...ANSWER
Answered 2018-Nov-23 at 19:09RxJS processes values as soon as they arrive. It's a push system.
IxJS specifies when to pass in the next value. It's a pull system.
ExplanationIxJS may be helpful if want to have pull-based model, for example, when dealing with backpressure.
As you can see in the documentation:
IxJS unifies both synchronous and asynchronous pull-based collections, just as RxJS unified the world of push-based collections. RxJS is great for event-based workflows where the data can be pushed at the rate of the producer, however, IxJS is great at I/O operations where you as the consumer can pull the data when you are ready.
In other words:
- Use
RxJSif your producer (usually User) is slower that processing of data (this is common for frontend). - Use
IxJSif your producer (usually System) is much faster than you can process data (more common for the backend).
To understand what this means, consider the following example:
You need to build ETL pipeline and process a large file (about 1TB).
If you write it with RxJS, something like:
QUESTION
I am trying to build an infinitely scrolling list using TypeScript and rxjs. That is, I want the application to fetch few pages of results from the backend, then fetch more results whenever the user scrolls near the bottom.
I have an Observable, built with Observable.prototype.expand(), which will give me all results, eventually fetching all pages from the server. However due to the nature of Observable, I cannot pause this process. Once I subscribe it will inevitably fetch all results as fast as possible. I need a different solution, where I can pull from the stream of results at the speed I need.
Things are made more complicated by the fact, that I cannot fetch the second page from the API directly, every page contains the info I need to fetch the next one. A reply looks like this:
...ANSWER
Answered 2017-Jul-29 at 10:21Simply don't use expand, because then you will be forced to mess around with a custom scheduler, which is needlessly complicated.
You could simply construct a Subject on which you dispatch scroll actions that you map asynchronously to new results. Here is rough sketch of the idea (w/o assuming a framework or even running this through the typescript compiler):
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