深入理解CoffeeScript

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"CoffeeScript in Action" 《CoffeeScript in Action》是Patrick Lee撰写的一本关于CoffeeScript编程语言的专业书籍，由Manning出版社出版。这本书详细介绍了CoffeeScript这一简洁且优雅的编程语言，它旨在简化JavaScript的语法，提高代码的可读性和可维护性。 CoffeeScript是一种静态类型的、编译到JavaScript的编程语言。它通过提供更简洁、更易于理解的语法，降低了JavaScript的学习曲线。CoffeeScript的主要特点包括其简洁的类定义、函数表达式、链式调用以及内建的列表推导等功能，这些特性使得代码更加紧凑和易读。书中的内容可能涵盖了以下知识点： 1. **基础语法**：书中会介绍CoffeeScript的基本语法结构，如变量声明、条件语句（if/else）、循环（for/while）、函数定义以及匿名函数的使用。 2. **函数与闭包**：CoffeeScript的函数表达式和JavaScript的闭包机制，如何利用闭包实现模块化和数据封装。 3. **类与对象**：CoffeeScript中的类（class）关键字简化了面向对象编程，同时也支持原型继承，让开发者能够更容易地创建和管理对象。 4. **数组与对象字面量**：CoffeeScript提供了更直观的数组和对象创建方式，例如通过索引或键值对的列表来快速创建它们。 5. **链式操作**：CoffeeScript支持链式方法调用，使得对象属性和方法的访问更加流畅。 6. **列表推导**：类似Python的列表推导式，用于简洁地生成新的数组。 7. **错误处理**：CoffeeScript的异常处理机制及其与JavaScript的差异。 8. **编译与转换**：如何将CoffeeScript代码编译成JavaScript，并在浏览器或Node.js环境中运行。 9. **实践应用**：书中可能会包含实际项目案例，展示CoffeeScript在Web开发中的应用，如前端框架、模块化开发和工具库的构建。 10. **最佳实践**：指导读者遵循最佳编码规范，提高代码质量和可维护性。此外，由于本书出自Manning出版社，通常会保持高质量的写作标准，深入浅出地解释技术概念，并配以丰富的示例代码。同时，购买者可能还能通过Manning网站获得额外的在线资源和作者支持，比如源代码下载、问答论坛等。《CoffeeScript in Action》是一本适合初学者和有一定经验的JavaScript开发者深入理解CoffeeScript的优秀教程，它可以帮助读者更高效、更优雅地编写JavaScript代码。

preface

I’ve long thought that the things that will ultimately resonate the most with people don’t

reveal themselves immediately. Instead, they might initially present themselves as slightly

interesting but not striking. I’ve seen this with music, film, literature, and every other

aspect of human experience that I’ve looked at for any substantial amount of time. I’ve

also seen this with at least two programming languages, JavaScript and CoffeeScript.

My early reaction to JavaScript was dismissive. Strangely, or not, years later I would be

working almost exclusively in it. My early reaction to CoffeeScript was also dismissive.

“Here we go,” I thought. “Yet another tool created because people don’t understand

JavaScript!” I was wrong about CoffeeScript just like I was wrong about JavaScript.

CoffeeScript is not about avoiding JavaScript—it is about understanding JavaScript.

This applies to both people who are already familiar with JavaScript and people who are

not familiar with JavaScript. Learning CoffeeScript helps people to understand Java-

Script. At the same time, for many people it makes writing JavaScript programs simpler

and more enjoyable, which means that it makes sense for them to use CoffeeScript

instead of JavaScript.

ABOUT THIS BOOK

xviii

of the language and begin to absorb it. In chapter 3 you’ll learn about functions from

the ground up, and in chapter 4 you’ll do the same with objects.

In part 2 you’ll learn how to wield your new understanding of CoffeeScript. Chap-

ter 5 will have you pulling apart objects and putting them together, and chapter 6 will

have you creating functions from functions, and from functions that create functions.

In chapter 7 you’ll hone your craft, technique, and style. After that comes chapter 8,

which leads you right to the heart of CoffeeScript where you’ll learn to change the

language itself. Finally prepared, in chapter 9 you’ll enter the dragon’s lair of asyn-

chronous programs.

In part 3 your travels will take you further from home where you’ll learn how to

build entire applications. This starts in chapter 10 where you’ll learn about test-driven

development. In chapter 11 you’ll learn about building user interfaces for web brows-

ers. In chapter 12 you’ll wrap everything up by building and packaging applications,

ready for the world to see. Finally, chapter 13 looks at the future and where you, the

journeyman, are headed with CoffeeScript.

Prerequisites

This book doesn’t assume any knowledge of CoffeeScript. Although some familiarity

with JavaScript will make things easier, no level of JavaScript experience is assumed.

What is assumed is some experience with programming (any language will do) and a

basic grasp of web development concepts. Finally, although the Node.js platform is

used throughout the book, no prior knowledge of Node.js is assumed.

Code conventions

Any source code listings inline within the text, such as

read

'book'

, are formatted

using a

fixed-width

font

. Blocks of code are also formatted in a

fixed-width

font

separated from page content:

read = (material) ->

console.log "Reading #{material}"

read 'CoffeeScript in Action'

Within blocks of code, a

character at the start of a line indicates that what follows the

is the result of evaluating the immediately preceding line:

read = (material) ->

console.log "Reading #{material}"

read 'CoffeeScript in Action'

# Reading CoffeeScript in Action

In this way, all of the code snippets can be pasted directly into a CoffeeScript prompt,

where the output you see should match the comment. A similar approach is taken

with JavaScript code snippets where

is replaced with

'Raw' + ' JavaScript'

// 'Raw JavaScript'

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