Change update to reducers

I used update because that’s how Elm calls it, but now that I am in the process of documenting HyperApp more thoroughly, I find myself explaining that update is an object composed of reducers, which begs the question, why then not just call it reducers?

[jorgebucaran]

https://github.com/hyperapp/hyperapp/commit/7a60a8f18163c31ec74c174c18337b7a31ae2dfb

I’ve changed it to reducers, but still back supporting update, which should be deprecated by 0.6.0 or later.

[jorgebucaran]

I think vuex choice is acceptable, since it’s really obvious your’re mutating a value.

const store = new Vuex.Store({
  state: 1,
  mutations: {
    add (state) { state++ }
  }
})

However, in HyperApp, things are slightly different:

update: {
  add: model => model + 1
}

…

const newModel = actions.add(oldModel, data)
render(view(newModel))

We don’t mutate the model, but rather create a new one from the old one.

---

Now, in reality, hyperapp does mutate the model, because that was simpler to implement and maintain than this:

const render = model =>
    view(model, (action, model) =>
        patch(element, render(reduce(model, action))))

<small>From yo-yo-app.</small>

But now, that’s an implementation detail 😆