Immer & immutable state All In One

Immer & immutable state All In One

Immer (German for: always) is a tiny package that allows you to work with immutable state in a more convenient way.

Immer（德语：always）是一个小包，可让您以更方便的方式处理不可变状态。

https://immerjs.github.io/immer/

https://github.com/immerjs/immer

$ npm install immer

Immer 如何工作

基本思想是，使用 Immer，您会将所有更改应用到临时 draft，它是 currentState 的代理。
一旦你完成了所有的 mutations，Immer 将根据对 draft state 的 mutations 生成 nextState。
这意味着您可以通过简单地修改数据来与数据交互，同时保留不可变数据的所有好处。

https://immerjs.github.io/immer/zh-CN/#immer-如何工作

demos

import produce from 'immer'

const todos = [
  {
    text: 'learn immer',
    done: false
  },
  {
    text: 'simplify all code',
    done: false
  }
]

const nextTodos = produce(todos, draft => {
  draft.push({ text: 'get coffee', done: true })
  draft[0].done = true
})

console.log(nextTodos.length)
console.log(todos[0].done)
console.log(nextTodos[0].done)

console.log(nextTodos === todos)
console.log(nextTodos[0] === todos[0])
console.log(nextTodos[1] === todos[1])

// Uncomment this line to raise the read-only exception
// nextTodos[0].done = false

https://egghead.io/lessons/redux-simplify-creating-immutable-data-trees-with-immer

https://egghead.io/lessons/javascript-introduction-to-the-in-depth-immer-course

https://immerjs.github.io/immer/zh-CN/example-setstate/

React Hooks

Use immer to drive state with a React hooks

https://github.com/immerjs/use-immer

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