For the past two years I have been using RxJS extensively, in Cycle.js and in other contexts. Recently, TylorS and I have decided to build a new reactive streams library comparable to RxJS, called xstream. TL;DR: we needed a reactive stream library tailored for Cycle.js. It needs to be “hot” only, so users don’t need to think about subscription semantics hidden in drivers. It should have only a fe

This post is a non-exhaustive quick overview of the so-called “unidirectional data flow” architectures. Not meant to be taken as a beginner tutorial, but rather as an overview of their differences and peculiarities. At the end, I’ll introduce a new architecture which deviates significantly from the others. This post assumes client-side Web UI frameworks only. TERMINOLOGY It would be confusing to t

Once in a while someone points out how ReactiveX (Rx) does not have means to avoid glitches. [1] [2] Glitches are temporary inconsistencies emitted by Observables. Consider this example: --a------b------c------d--------e-------- --1-------------2---------------3-------- combineLatest --a1-----b1-----(c1c2)-d2-------(e2e3)--- Events in parentheses happen “simultaneously”. In practice they happen at