Files
freeCodeCamp/curriculum/challenges/portuguese/03-front-end-development-libraries/react/write-a-react-component-from-scratch.md
Shaun Hamilton c2a11ad00d 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>
2021-08-13 21:57:13 -05:00

2.6 KiB

id, title, challengeType, forumTopicId, dashedName
id title challengeType forumTopicId dashedName
5a24c314108439a4d4036168 Escrever um componente do React do zero 6 301424 write-a-react-component-from-scratch

--description--

Agora que você aprendeu os conceitos básicos de componentes JSX e React, é hora de escrever um componente por conta própria. Componentes do React são os blocos centrais de construção de aplicações React, por isso é importante se familiarizar com a escrita. Lembre-se, um componente típico do React é uma class do ES6 que estende React.Component. Ele possui um método de renderização que retorna HTML (a partir de JSX) ou null. Essa é a forma básica de um componente do React. Assim que você entender bem, você estará preparado para começar a construir projetos mais complexos em React.

--instructions--

Define uma classe MyComponent que estende React.Component. Seu método de renderização deve retornar uma div que contém uma tag h1 com o texto: My First React Component! nela. Use este texto exatamente, letras maiúsculas e minúsculas, e pontuação importam. Certifique-se de chamar o construtor para seu componente também.

Renderize este componente para o DOM usando ReactDOM.render(). Há um div com id='challenge-node' disponível para você usar.

--hints--

Deve haver um componente React chamado MyComponent.

(getUserInput) =>
  assert(
    __helpers
      .removeWhiteSpace(getUserInput('index'))
      .includes('classMyComponentextendsReact.Component{')
  );

MyComponent deve conter uma tag h1 com texto My First React Component! Letras maiúsculas e minúsculas, e pontuação importam.

assert(
  (function () {
    const mockedComponent = Enzyme.mount(React.createElement(MyComponent));
    return mockedComponent.find('h1').text() === 'My First React Component!';
  })()
);

MyComponent deve existir e ser rendizado no DOM.

assert(document.getElementById('challenge-node').childNodes.length === 1);

MyComponent deve ter um construtor chamando super com props.

assert(
  MyComponent.toString().includes('MyComponent(props)') &&
    MyComponent.toString().includes('_super.call(this, props)')
);

--seed--

--seed-contents--

// Change code below this line

--solutions--

// Change code below this line
class MyComponent extends React.Component {
  constructor(props) {
    super(props);
  }
  render() {
    return (
      <div>
        <h1>My First React Component!</h1>
      </div>
    );
  }
};

ReactDOM.render(<MyComponent />, document.getElementById('challenge-node'));