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Reactive Programming with Diff and Patch

YOW! Lambda Jam 2018

Writing reactive programs can be challenging. Such programs need to be able to react efficiently to changes as they stream in from the outside world, which often leads people to make their program logic incremental in an ad-hoc way, directly expressing their logic in terms of how to integrate a change, rather than as an all-at-once
computation.
But such ad-hoc incrementalization is complicated, and the resulting programs can be hard to reason about. In this talk, I'll discuss an approach that leverages the fact that functional data structures can often be diffed efficiently. I'll show how the ability to diff and patch can be integrated into a more general reactive programming
framework to let you write programs which read like simple, all-at-once implementations of your program logic, but which perform like hand-optimized change-oriented programs.