Kefir

Kefir: Open-Source JavaScript Library for Functional Reactive Programming

A JavaScript library for working with observable streams in a functional reactive style, similar to RxJS, used for building user interfaces that react and update based on changing data.

What is Kefir?

Kefir is an open-source JavaScript library that implements the concept of functional reactive programming (FRP) by providing support for observable streams. Just like RxJS, it allows you to represent asynchronous events and time-varying values as observable sequences that can be composed together in a declarative manner.

Some key capabilities and benefits of using Kefir include:

• Composable streams - You can combine multiple streams together using an API similar to array functions like map, filter, concat, etc.
• Event streams - Represents events happening over time like user input, HTTP requests etc.
• Value streams - Represents values that change over time like state, data feeds etc.
• Error handling - Errors can be represented as streams for easier error management
• Side effect handling - Allows you to model side effects using streams while keeping application code pure
• Small size - Kefir has a very small footprint at around 7KB gzipped so it's very browser-friendly

Kefir is most commonly used for building user interfaces that react and update based on changing data. For example, user input streams, data update streams from a server, etc can be wired up to a UI component that re-renders accordingly. It makes building real-time apps easier to reason about.

Kefir Features

Official Links