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es6-features's Introduction

ES 6: Visão geral e comparação com a ES 5

Copyright (c) 2015-2016 Ralf S. Engelschall <[email protected]> <@engelschall>
Partially based on code snippets by Luke Hoban.
Traduzido para o português do Brasil por Maujor
Licensed under MIT license.

O website da tradução encontra-se em https://maujor.github.io/es6-features, e apresenta uma visão geral das funcionalidades da linguagem ES 6 e uma comparação com das funcionalidades equivalentes da antiga ES 5.

Perguntas frequentes? (FAQ)

  • Por que este repositório e respectivo website foram criados? Consultar a especificação para a ECMAScript 2005 não é suficiente?

    Este projeto foi criado pelo cientista da computação e arquiteto de software Ralf S. Engelschall em março de 2015 com a finalidade de documentar as funcionalidades da ES 6 para consulta em seus projetos de engenharia de software e criar uma fonte de consulta contendo as funcionalidades da ES 6. Além disso, o ato de criar o website constitui-se em um ótimo exercício prático para Ralf S. Engelschall aprender as funcionalidades da ES 6.

  • Onde encontro uma listagem mostrando as funcionalidades da ES 6 suportadas pelas versões atuais dos diferentes navegadores?

    Para suporte às funcionalidades da ES 6 consulte a tabela de compatibilidade com a ECMAScript criada por kangax. Na tabela observe a coluna "Babel + core-js". Nela você encontra as funcionalidades que já podem ser usadas com uso de "transpiling" (o que é suficiente para a prática).

  • Onde encontro a especificação para ES 6?

    A versão da especificação ES 6 (ECMA-262) foi publicada em junho de 2015. A especificação encontra-se em ecmascript.org.

  • Posso usar ECMAScript 6 ainda que meu JavaScript runtime não ofereça suporte?

    Sim. Use o transpiler Babel. For Node.js/io.js environments just use its tricky require hook. For browser environments use Babel in conjunction with Browserify and its Babelify plugin. For other tools see Using Babel. If you want to see pre-integrated scenarios, check out our sibling project es6-support for various code examples!

  • Why does the website default use the "reduced" syntactic sugar style (without semicolons) for ECMAScript 6 and the "traditional" syntactic sugar style (with semicolons) for ECMAScript 5?

    ECMAScript since its earliest days supported automatic semicolon inference/insertion, of course. But people coding ECMAScript 5 started it in an era where lots of tools (especially source code compressors) had problems when semicolons where left out from the source code. As a consequence, most ECMAScript 5 coders maintained the traditional coding style with semicolons as the syntactic sugar, although in most of the cases they are not necessary. But this era is gone today. Both ECMAScript 6 and all tools (including compressors) perfectly support automatic semicolon inference/insertion nowadays. As a consequence, ECMAScript 6 coders nowadays can get rid of nearly all semicolons and remove clutter from their source code. Ralf S. Engelschall is a strong promoter of reducing source code to its bare minimum. Hence, in his personal opinion ECMAScript 6 should be coded with as less syntactic sugar as possible and hence without semicolons. But if you disagree, just switch the shown style on the website. If you even need to enforce a particular style for both ES6 and ES5 code snippets in your bookmarks, just use one of the following URLs: ES6-Features (reduced style) or ES6-Features (traditional style)

  • I still don't understand: why should I use ECMAScript 6? ECMAScript 5 looks sufficient.

    ECMAScript 5 is a nice and decent programming language, of course. But because of its history, it has some nasty aspects which ECMAScript 6 finally resolves. As programming never is just about getting the necessary functionality done, it is advised to also use the best language, too. ECMAScript 6's language design is cleaner than ECMAScript 5, its syntax increases the expressiveness of your code, it decreases the necessary boilerplate code (e.g. function vs. arrow syntax) and it especially let you get rid of some very nasty but required hacks and workarounds from the ECMAScript 5 era (e.g. var self = this). So, ECMAScript 5 might be sufficient, but ECMAScript 6 nevertheless is an important improvement.

  • Encontrei um erro, como posso contribuir?

    O projeto para o site da tradução é diferente do projeto para o site original e usa os arquivos index.html e README.md. Edite um destes dois arquivos com o erro e envie um pull request.

  • Você tem outras indicações de consulta às funcionalidades ECMAScript 6?

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