feat: add 'back/front end' in curriculum (#42596)
* 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>
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---
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id: 5a24c314108439a4d4036163
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title: 创建一个 React 组件
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challengeType: 6
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forumTopicId: 301386
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dashedName: create-a-react-component
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---
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# --description--
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定义 React 组件的另一种方法是使用 ES6 的 `class`语法。 在以下示例中,`Kitten` 扩展了`React.Component`:
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```jsx
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class Kitten extends React.Component {
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constructor(props) {
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super(props);
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}
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render() {
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return (
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<h1>Hi</h1>
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);
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}
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}
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```
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这将创建一个 ES6 类 `Kitten`,它扩展了 `React.Component` 类。 因此,`Kitten` 类现在可以访问许多有用的 React 功能,例如本地状态和生命周期钩子。 如果还不熟悉这些术语,请不要担心,在以后的挑战中我们将更详细地介绍它们。 另请注意,`Kitten` 类中定义了一个调用 `super()` 方法的 `constructor`。 它使用 `super()` 调用父类的构造函数,即本例中的 `React.Component`。 构造函数是使用 `class` 关键字创建的特殊方法,它在实例初始化之前调用。 最佳做法是在组件的 `constructor` 里调用 `super`,并将 `props` 传递给它们, 这样可以保证组件能够正确地初始化。 目前为止 ,需要知道这些代码是必要的。 很快会了解到到构造函数的其他用途以及 `props`。
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# --instructions--
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`MyComponent` 是使用类语法在代码编辑器中定义的。 完成 `render` 方法的编写,使其返回 `div` 元素,其中包含文本内容为 `Hello React!` 的 `h1` 元素。
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# --hints--
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该 React 组件应该返回一个 `div` 元素。
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```js
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assert(Enzyme.shallow(React.createElement(MyComponent)).type() === 'div');
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```
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返回的 `div` 中应该渲染一个 `h1` 标题。
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```js
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assert(
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/<div><h1>.*<\/h1><\/div>/.test(
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Enzyme.shallow(React.createElement(MyComponent)).html()
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)
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);
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```
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`h1` 标题中应该包含字符串 `Hello React!`。
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```js
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assert(
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Enzyme.shallow(React.createElement(MyComponent)).html() ===
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'<div><h1>Hello React!</h1></div>'
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);
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```
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# --seed--
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## --after-user-code--
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```jsx
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ReactDOM.render(<MyComponent />, document.getElementById('root'))
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```
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## --seed-contents--
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```jsx
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class MyComponent extends React.Component {
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constructor(props) {
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super(props);
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}
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render() {
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// Change code below this line
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// Change code above this line
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}
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};
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```
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# --solutions--
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```jsx
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class MyComponent extends React.Component {
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constructor(props) {
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super(props);
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}
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render() {
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// Change code below this line
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return (
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<div>
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<h1>Hello React!</h1>
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</div>
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);
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// Change code above this line
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}
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};
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```
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