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What would you like to do?

architectures and whatnot

  1. plain ol' React
let state = initial
render(view(state), element)
  • view is pure!
  • the above + setState/lifecycle methods/props/callbacks are good for simple web pages
  • problem - no real concept of state changing over time
  1. flux
let state = initial
let reduce = (state, action) => {}

function step(action){
  // possible side effects //
  state = reduce(state, action)
  render(view(state), element)    

// then call `step` on every `action`
  • reduce is pure!
  • good for simple - intermediate apps
  • assumes state is in the shape that view wants
  • no real distinction between reads/writes on the store
  • it's up to the 'possible side effects' to 'decide' how to do remote syncs
  1. relay / / falcor

the core idea is - state =

let read = (state, query, params) => {}
let mutate = (state, mutation) => {}
let remote = (query/mutation, merge) => {}

let model = ({ read, mutate, data, remote })

function step(mutation){  
  model.transact(mutation) // possible side effects, remote syncs
  let state = // possible remote reads
  render(view(state), element)    
  • read / mutate are pure!
  • in practice, you'd rarely trigger reads manually, mostly mutations. data fetching for free!
  • view.query() is a simple data structure, which can be optimized, serialized, etc
  • we can now use the view's query to hold a bunch of ui 'state' we'd have otherwise saved in the store
  • via relay - view can expect state to be in the shape of its query
  • can do incremental rendering based on what reads were asked, etc
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