94 lines
2.0 KiB
Markdown
94 lines
2.0 KiB
Markdown
# Recipes
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## Mapping a mutation to all values of a state
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Say you have a `todos` state that is an array of `todo` sub-states, with some
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actions that should percolate to all todos, and some that should only
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percolate to one. One way to model this is via updux's splat subduxes
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(backed by `updeep`'s own '*'-key behavior).
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```
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const done = () => (state) => ({...state, done: true});
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const todo = new Updux({
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initial: { id: 0, done: false },
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actions: {
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done: null,
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doneAll: null,
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},
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mutations: {
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done,
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doneAll: done,
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},
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});
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const todos = new Updux({
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initial: [],
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subduxes: { '*': todo },
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actions: { addTodo: null },
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mutations: {
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addTodo: text => state => [ ...state, { text } ]
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}
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});
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todos.setMutation(
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todo.actions.done,
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(text,action) => u.map(u.if(u.is('text',text), todo.upreducer(action))),
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true // prevents the subduxes mutations to run automatically
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);
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```
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## Usage with Immer
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While Updux was created with Updeep in mind, it also plays very
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well with [Immer](https://immerjs.github.io/immer/docs/introduction).
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For example, taking this basic updux:
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```
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import Updux from 'updux';
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const updux = new Updux({
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initial: { counter: 0 },
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mutations: {
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add: (inc=1) => state => ({ counter: state.counter + inc })
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}
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});
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```
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Converting it to Immer would look like:
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```
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import Updux from 'updux';
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import { produce } from 'immer';
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const updux = new Updux({
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initial: { counter: 0 },
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mutations: {
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add: (inc=1) => produce( draft => draft.counter += inc ) }
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}
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});
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```
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But since typing `produce` over and over is no fun, `groomMutations`
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can be used to wrap all mutations with it:
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```
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import Updux from 'updux';
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import { produce } from 'immer';
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const updux = new Updux({
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initial: { counter: 0 },
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groomMutations: mutation => (...args) => produce( mutation(...args) ),
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mutations: {
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add: (inc=1) => draft => draft.counter += inc
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}
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});
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```
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