An introduction to reactive programming



An introduction to reactive programming

There has been a significant shift in recent years towards server-side and network programming using event-driven asynchronous runtime environments and frameworks such as Node.js, Twisted, and Netty/NIO. Asynchronous code allows independent IO operations to run concurrently, resulting in efficient code. However, this improved efficiency comes at a cost — straightforward synchronous code may become a mess of nested callbacks.

Can we do better? Can we combine the simplicity of synchronous code with the efficiency of the asynchronous approach? It turns out we can. Futures are an abstraction that allow us to express the effect of latency in asynchronous computations, encapsulate event-handling code, and use higher-order functions such as map, reduce, and filter, to compose clean and readable asynchronous code.


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