Bacon.js and the Dawn of Reactive Programming: A Retrospective

Before React fundamentally changed how we thought about UI state, and before RxJS became the undisputed heavyweight champion of asynchronous JavaScript, the frontend landscape of the early 2010s was a wild west of jQuery callbacks and unpredictable state mutations. Managing asynchronous data flows—user clicks, network requests, animations—often resulted in what developers affectionately called "callback hell." It was during this era that Functional Reactive Programming (FRP) began to bleed into mainstream web development. Looking back, the early days of reactive programming were less about massive frameworks and more about fundamentally shifting how developers conceptualized time and data. At the forefront of that shift in the JavaScript ecosystem was Bacon.js . The Bacon.js Paradigm: Streams and Properties Created by Juha Paananen, Bacon.js offered a clean, intuitive, and highly functional approach to handling events over time. What made Bacon.js truly special—and what many argue it d