深入理解ES6：人类友好的JavaScript新标准

ES6

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"ES6_for_Humans" 是一本关于JavaScript ES2015及其后续版本的指南，由Deepak Grover和Hanu Prateek Kunduru合著，旨在帮助开发者理解和掌握ES6的新特性。本书详细介绍了JavaScript的最新标准，涵盖了从ES2015到更现代的版本。作者通过简洁易懂的方式解释了ES6中的关键概念，旨在让“人类”（即非专业人士）也能轻松理解这个复杂的编程语言更新。书中包括以下章节： 1. **Getting Started with ES6**：这一章引导读者进入ES6的世界，介绍新引入的基础语法和变化，帮助初学者快速上手。 2. **New Syntax in ES6**：讲解了如箭头函数、模板字符串、let和const变量声明等新的语法结构。 3. **Destructuring**：深入探讨对象和数组的解构赋值，这是一种简化数据提取的高效方法。 4. **Classes in ES6**：介绍了类的概念，使得面向对象编程在JavaScript中更加清晰和直观。 5. **Modules**：讲解了模块系统，这是组织和导入/导出代码的重要方式。 6. **Symbols in ES6**：介绍了一种新的原始数据类型，用于创建唯一的标识符。 7. **Arrays and Collections**：涵盖了数组的扩展操作，如扩展运算符、fill方法和findIndex等。 8. **Iterators and Generators**：讨论迭代器协议和生成器函数，为处理集合数据提供了新的控制流工具。 9. **Promises in ES6**：讲解了异步编程的核心概念——Promise，以及如何处理复杂的异步流程。此外，书中的源代码和其他补充材料可以通过GitHub在本书的产品页面获取，提供了实践和学习的额外资源。这本书不仅适合JavaScript新手，也对有经验的开发者提供了深入理解ES6新特性的机会，帮助他们在实际开发中更好地利用这些功能。 "ES6 for Humans" 是一本全面的教程，它详细阐述了ES6的关键特性，并通过实例和清晰的解释帮助读者掌握这些新特性，从而提升他们的JavaScript开发技能。无论是为了个人学习还是团队培训，这本书都是一份宝贵的资源。

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CHAPTER 1 ■ GETTING STARTED WITH ES6

Now, create a new index.html file and index.js file in the root directory of your

project And your current project directory should look like the following:

├── index.html

├── node_modules

├── package.json

├── index.js

Configuring Webpack

The next step is to set up webpack by creating a configuration file - webpack.config.js in

the root directory of your project.

A webpack configuration file is a CommonJS-style module where a configuration

object is exported out of this module.

// webpack.config.js

module.exports = {

entry: './index.js',

output: {

path: './dist',

filename: 'bundle.js'

}

};

Here, entry is the path to the source of your project and webpack will analyze your

entry file for dependencies and generate a bundled output (which includes all the

dependency modules). Note that only the entry module is executed on startup.

Add Loaders

Loaders allow you to preprocess files as you load them. Loaders provide a powerful way

to handle front-end build steps and can transform files from a different language, like

CoffeeScript to JavaScript or inline images as data URLs. For example, babel-loader uses

Babel to load ES2015 files.

So now, modify webpack.config.js to process all .js files using babel-loader:

module.exports = {

entry: './index.js',

output: {

path: __dirname + '/dist',

publicPath: '/dist/',

filename: 'bundle.js'

CHAPTER 1 ■ GETTING STARTED WITH ES6

You can run npm run watch to see the transpiled code in your bundle.js file

located inside the dist directory, which will have this chunk of transpiled ES5 code:

function(module, exports) {

"use strict";

var helloWorld = function sayHello() {

console.log("Hello! We are all set!");

console.log("Arrow functions are working");

};

helloWorld();

}

Finally, we also recommend using ESLint in your project to use best practices and

avoid errors while writing your code. You can find the above boilerplate code at

https://github.com/metagrover/ES6-boilerplate, which also has an .eslintrc file

that contains the standard rules and configurations we use.

Summary

JavaScript is one of the most powerful languages on the Web today, and it is only getting

stronger. ES6, or officially ES2015 and the versions that follow, brings in a new paradigm

to JavaScript. As we will see in the next few chapters, there is a lot of new stuff for a

conventional JavaScript developer. But it is important for existing JavaScript developers to

become aware of the new features to stay ahead of the curve as more and more features

become mainstream in the world of browsers and frameworks.

JavaScript is moving quicker than ever before and transpilers and shims/polyfills

are important tools to keep you on the forefront of where the language is headed.

ECMAScript 6 comes with a very extensive list of new additions to the language and

each of these features was carefully considered, discussed at length, and chosen by the

community to become a part of the standard. Now it’s up to us developers to use and

apply the new standard to our products to better serve the people using them.

You might be asking yourself, is the change worth it. Is integrating ES6 into your

projects and work necessary and do you really need to change the existing ways of

doing things. We would like to say "Yes, it is worth it," and through this book we aspire

to encourage you to adapt to this new world. Even if you face some resistance in moving

away from the old ways, we suggest you stick with it and change your practices.

The JavaScript community is extremely vibrant and dynamic with things changing at a

rapid rate. ES6/ES2015 knowledge is now expected among JavaScript developers. The new

language constructs have not only become popular, but are now also widely supported.

Mastering the inner workings of ES6 will let you build modern applications and give you

access to a more powerful language and help you improve your programming skills.

Through ES6, you will have access to more powerful programming concepts like

practical object oriented code among other new features that were simply not possible in

the past. We hope to introduce you a modern workflow and tools like Babel and Webpack

to make application development faster and more enjoyable. You will then be able to

measure code quality and write more testable JavaScript.

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