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: 5a24c314108439a4d403616a
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title: 传递一个数组作为 Props
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challengeType: 6
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forumTopicId: 301401
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dashedName: pass-an-array-as-props
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---
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# --description--
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上一个挑战演示了如何将来自父组件的信息作为 `props` 传递给子组件。 这个挑战着眼于如何将数组作为 `props` 传递。 要将数组传递给 JSX 元素，必须将其视为 JavaScript 并用花括号括起来。
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```jsx
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<ParentComponent>
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<ChildComponent colors={["green", "blue", "red"]} />
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</ParentComponent>
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```
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这样，子组件就可以访问数组属性 `colors`。 访问属性时可以使用 `join()` 等数组方法。 `const ChildComponent = (props) => <p>{props.colors.join(', ')}</p>` 这将把所有 `colors` 数组项连接成一个逗号分隔的字符串并生成： `<p>green, blue, red</p>` 稍后，我们将了解在 React 中渲染数组数据的其他常用方法。
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# --instructions--
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代码编辑器中有 `List` 和 `ToDo` 组件。 在 `ToDo` 组件中渲染每个 `List` 时，传入 `tasks` 属性并将其分配给待办任务数组，例如 `["walk dog", "workout"]`。 然后访问 `List` 组件中的 `tasks` 数组，在`p`元素中显示其值。 使用 `join(", ")` 把 `props.tasks` 数组作为逗号分隔列表显示在 `p` 元素中。 今天的列表应该至少有 2 个任务，明天的列表应该至少有 3 个任务。
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# --hints--
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`ToDo` 组件应该返回单个外部 `div`。
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ToDo));
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return mockedComponent.children().first().type() === 'div';
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})()
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);
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```
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`ToDo` 组件的第三个子元素应该是 `List` 组件的一个实例。
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ToDo));
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return mockedComponent.children().first().childAt(2).name() === 'List';
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})()
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);
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```
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`ToDo` 组件的第五个子元素应该是 `List` 组件的一个实例。
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ToDo));
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return mockedComponent.children().first().childAt(4).name() === 'List';
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})()
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);
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```
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`List` 组件的两个实例都应该具有一个名为 `tasks` 的属性，并且 `tasks` 的类型应该是数组。
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ToDo));
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return (
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Array.isArray(mockedComponent.find('List').get(0).props.tasks) &&
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Array.isArray(mockedComponent.find('List').get(1).props.tasks)
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);
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})()
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);
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```
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表示今天任务的第一个 `List` 组件应该有 2 个或更多项。
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ToDo));
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return mockedComponent.find('List').get(0).props.tasks.length >= 2;
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})()
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);
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```
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表示明天任务的第二个 `List` 组件应该有 3 个或更多项。
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ToDo));
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return mockedComponent.find('List').get(1).props.tasks.length >= 3;
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})()
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);
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```
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`List` 组件应在 `p` 标签中渲染 `tasks` 属性的值。
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(ToDo));
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return (
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mockedComponent
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.find('p')
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.get(0)
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.props.children.replace(/\s*,\s*/g, ',') ===
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mockedComponent
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.find('List')
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.get(0)
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.props.tasks.join(',')
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.replace(/\s*,\s*/g, ',') &&
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mockedComponent
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.find('p')
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.get(1)
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.props.children.replace(/\s*,\s*/g, ',') ===
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mockedComponent
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.find('List')
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.get(1)
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.props.tasks.join(',')
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.replace(/\s*,\s*/g, ',')
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);
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})()
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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(<ToDo />, document.getElementById('root'))
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```
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## --seed-contents--
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```jsx
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const List = (props) => {
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{ /* Change code below this line */ }
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return <p>{}</p>
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{ /* Change code above this line */ }
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};
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class ToDo 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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<div>
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<h1>To Do Lists</h1>
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<h2>Today</h2>
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{ /* Change code below this line */ }
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<List/>
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<h2>Tomorrow</h2>
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<List/>
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{ /* Change code above this line */ }
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</div>
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);
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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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const List= (props) => {
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return <p>{props.tasks.join(', ')}</p>
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};
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class ToDo 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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<div>
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<h1>To Do Lists</h1>
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<h2>Today</h2>
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<List tasks={['study', 'exercise']} />
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<h2>Tomorrow</h2>
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<List tasks={['call Sam', 'grocery shopping', 'order tickets']} />
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</div>
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);
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}
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};
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```
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