* chore: rename APIs and Microservices to include "Backend" (#42515) * fix typo * fix typo * undo change * Corrected grammar mistake Corrected a grammar mistake by removing a comma. * change APIs and Microservices cert title * update title * Change APIs and Microservices certi title * Update translations.json * update title * feat(curriculum): rename apis and microservices cert * rename folder structure * rename certificate * rename learn Markdown * apis-and-microservices -> back-end-development-and-apis * update backend meta * update i18n langs and cypress test Co-authored-by: Shaun Hamilton <shauhami020@gmail.com> * fix: add development to front-end libraries (#42512) * fix: added-the-word-Development-to-front-end-libraries * fix/added-the-word-Development-to-front-end-libraries * fix/added-word-development-to-front-end-libraries-in-other-related-files * fix/added-the-word-Development-to-front-end-and-all-related-files * fix/removed-typos-from-last-commit-in-index.md * fix/reverted-changes-that-i-made-to-dependecies * fix/removed xvfg * fix/reverted changes that i made to package.json * remove unwanted changes * front-end-development-libraries changes * rename backend certSlug and README * update i18n folder names and keys * test: add legacy path redirect tests This uses serve.json from the client-config repo, since we currently use that in production * fix: create public dir before moving serve.json * fix: add missing script * refactor: collect redirect tests * test: convert to cy.location for stricter tests * rename certificate folder to 00-certificates * change crowdin config to recognise new certificates location * allow translations to be used Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com> * add forwards slashes to path redirects * fix cypress path tests again * plese cypress * fix: test different challenge Okay so I literally have no idea why this one particular challenge fails in Cypress Firefox ONLY. Tom and I paired and spun a full build instance and confirmed in Firefox the page loads and redirects as expected. Changing to another bootstrap challenge passes Cypress firefox locally. Absolutely boggled by this. AAAAAAAAAAAAAAA * fix: separate the test Okay apparently the test does not work unless we separate it into a different `it` statement. >:( >:( >:( >:( Co-authored-by: Sujal Gupta <55016909+heysujal@users.noreply.github.com> Co-authored-by: Noor Fakhry <65724923+NoorFakhry@users.noreply.github.com> Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com> Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>
3.7 KiB
id, title, challengeType, forumTopicId, dashedName
id | title | challengeType | forumTopicId | dashedName |
---|---|---|---|---|
5a24c314108439a4d4036151 | 使用 Switch 语句处理多个 Actions | 6 | 301449 | use-a-switch-statement-to-handle-multiple-actions |
--description--
可以定义 Redux store 处理多种 action 类型。 假设在 Redux store 中管理用户身份验证。 希望用状态表示用户登录和注销。 使用 state 的 authenticated
属性表示它。 还需要使用 action creators 创建与用户登录和用户注销相对应的 action,以及 action 对象本身。
--instructions--
代码编辑器为你创建了 store、actions、action creators。 通过编写 reducer
函数来处理多个身份验证操作。 可以在 reducer
里通过使用 JavaScript 的 switch
来响应不同的 action 事件。 这是编写 Redux reducers 的标准模式。 switch 语句应该切换 action.type
并返回适当的身份验证状态。
注意: 此时,不要担心 state 的不变性,因为在这个示例中它很小而且很简单。 所以对于每个操作都可以返回一个新对象,比如 {authenticated: true}
。 另外,不要忘记在 switch 语句中写一个 default
case,返回当前的 state
。 这是很重要的,因为当程序有多个 reducer,当每一个 action 被 dispatch 时它们都会运行,即使 action 与该 reducer 无关。 在这种情况下,你要确保返回当前的 state
--hints--
调用函数 loginUser
应该返回一个 type 属性设置为字符串 LOGIN
的对象。
assert(loginUser().type === 'LOGIN');
调用函数 logoutUser
应该返回一个 type 属性设置为字符串 LOGOUT
的对象。
assert(logoutUser().type === 'LOGOUT');
store 应该设置一个 authenticated
属性设置为 false
的初始化对象。
assert(store.getState().authenticated === false);
dispatch loginUser
应该将 store 中的 state 的 authenticated
值更新为 true
。
assert(
(function () {
const initialState = store.getState();
store.dispatch(loginUser());
const afterLogin = store.getState();
return (
initialState.authenticated === false && afterLogin.authenticated === true
);
})()
);
dispatch logoutUser
应该将 store 中的 state 的 authenticated
值更新为 false
。
assert(
(function () {
store.dispatch(loginUser());
const loggedIn = store.getState();
store.dispatch(logoutUser());
const afterLogout = store.getState();
return (
loggedIn.authenticated === true && afterLogout.authenticated === false
);
})()
);
authReducer
函数应该使用 switch
语句处理多个 action 类型。
(getUserInput) =>
assert(
getUserInput('index').toString().includes('switch') &&
getUserInput('index').toString().includes('case') &&
getUserInput('index').toString().includes('default')
);
--seed--
--seed-contents--
const defaultState = {
authenticated: false
};
const authReducer = (state = defaultState, action) => {
// Change code below this line
// Change code above this line
};
const store = Redux.createStore(authReducer);
const loginUser = () => {
return {
type: 'LOGIN'
}
};
const logoutUser = () => {
return {
type: 'LOGOUT'
}
};
--solutions--
const defaultState = {
authenticated: false
};
const authReducer = (state = defaultState, action) => {
switch (action.type) {
case 'LOGIN':
return {
authenticated: true
}
case 'LOGOUT':
return {
authenticated: false
}
default:
return state;
}
};
const store = Redux.createStore(authReducer);
const loginUser = () => {
return {
type: 'LOGIN'
}
};
const logoutUser = () => {
return {
type: 'LOGOUT'
}
};