There are a large number of different functions that can be applied to streams. If you happen to decide on the RxJS library for your FRP needs in JavaScript, many of the most common functions have been implemented for you. More complex functions can often be written as a chain of the included functions so try to think of a way to create the functionality you want by chaining before writing your own functions.

Frequently, asynchronous calls across the network in JavaScript fail. Networks are unreliable, mobile networks doubly so. For the most part when the network fails, our application fails. Streams provide an easy fix to this by allowing you to easily retry failed subscriptions. In RxJS this method is called Retry. Slotting it into any observable chain makes it more resilient to network failures.