70 lines
3.9 KiB
Markdown
70 lines
3.9 KiB
Markdown
---
|
||
id: 5a24c314108439a4d4036157
|
||
title: Write a Counter with Redux
|
||
challengeType: 6
|
||
isRequired: false
|
||
videoUrl: ''
|
||
localeTitle: 用Redux写一个计数器
|
||
---
|
||
|
||
## Description
|
||
<section id="description">现在您已经了解了Redux的所有核心原则!您已经了解了如何创建操作和操作创建器,创建Redux存储,针对存储分派操作以及使用纯reducer设计状态更新。您甚至已经了解了如何使用reducer组合管理复杂状态并处理异步操作。这些示例过于简单,但这些概念是Redux的核心原则。如果您理解它们,那么您已准备好开始构建自己的Redux应用程序。接下来的挑战涵盖了有关<code>state</code>不变性的一些细节,但首先,这里是对迄今为止所学到的所有内容的回顾。 </section>
|
||
|
||
## Instructions
|
||
<section id="instructions">在本课程中,您将从头开始使用Redux实现一个简单的计数器。代码编辑器中提供了基础知识,但您必须填写详细信息!使用提供的名称并定义<code>incAction</code>和<code>decAction</code>操作创建者, <code>decAction</code> <code>counterReducer()</code> , <code>INCREMENT</code>和<code>DECREMENT</code>操作类型,最后定义Redux <code>store</code> 。一旦完成,您应该能够发送<code>INCREMENT</code>或<code>DECREMENT</code>操作来增加或减少<code>store</code>保存的状态。祝你好运第一个Redux应用程序! </section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: 动作创建者<code>incAction</code>应返回<code>type</code>等于<code>INCREMENT</code>值的动作对象
|
||
testString: 'assert(incAction().type ===INCREMENT, "The action creator <code>incAction</code> should return an action object with <code>type</code> equal to the value of <code>INCREMENT</code>");'
|
||
- text: 动作创建者<code>decAction</code>应与返回动作对象<code>type</code>等于的值<code>DECREMENT</code>
|
||
testString: 'assert(decAction().type === DECREMENT, "The action creator <code>decAction</code> should return an action object with <code>type</code> equal to the value of <code>DECREMENT</code>");'
|
||
- text: Redux存储应该以0 <code>state</code>初始化。
|
||
testString: 'assert(store.getState() === 0, "The Redux store should initialize with a <code>state</code> of 0.");'
|
||
- text: 在Redux存储上调度<code>incAction</code>应该将<code>state</code>增加1。
|
||
testString: 'assert((function() { const initialState = store.getState(); store.dispatch(incAction()); const incState = store.getState(); return initialState + 1 === incState })(), "Dispatching <code>incAction</code> on the Redux store should increment the <code>state</code> by 1.");'
|
||
- text: 在Redux存储上调度<code>decAction</code>应该将<code>state</code>减1。
|
||
testString: 'assert((function() { const initialState = store.getState(); store.dispatch(decAction()); const decState = store.getState(); return initialState - 1 === decState })(), "Dispatching <code>decAction</code> on the Redux store should decrement the <code>state</code> by 1.");'
|
||
- text: <code>counterReducer</code>应该是一个函数
|
||
testString: 'assert(typeof counterReducer === "function", "<code>counterReducer</code> should be a function");'
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='jsx-seed'>
|
||
|
||
```jsx
|
||
const INCREMENT = null; // define a constant for increment action types
|
||
const DECREMENT = null; // define a constant for decrement action types
|
||
|
||
const counterReducer = null; // define the counter reducer which will increment or decrement the state based on the action it receives
|
||
|
||
const incAction = null; // define an action creator for incrementing
|
||
|
||
const decAction = null; // define an action creator for decrementing
|
||
|
||
const store = null; // define the Redux store here, passing in your reducers
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
```js
|
||
// solution required
|
||
```
|
||
</section>
|