0-60 in 15 Minutes: Building a Realtime App With Elm and Horizon
summary
Builds a realtime chat using Elm plus Horizon (Horizon runs on Node and RethinkDB) and claims zero backend and minimal JavaScript by using a thin Elm-Horizon wrapper over the Horizon JS client. Uses Elm ports to send commands and watch subscription to receive live updates, models modifiers as union types, and pairs every operation with a command and subscription. Demo shows two browser windows syncing messages, plus insert, update, and delete all working in real time.
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