CoffeeScript：优雅提升JavaScript编程体验

需积分: 10 100 浏览量更新于2024-07-18 收藏 10.77MB PDF 举报

"CoffeeScript in Action" 《CoffeeScript in Action》这本书由Patrick Lee撰写，深入探讨了一种基于JavaScript的转译语言——CoffeeScript。CoffeeScript由Jeremy Ashkenas创造，被形容为JavaScript的简约版，它引入了类似Ruby和Python的语法，旨在提升JavaScript的可读性和编写效率。 CoffeeScript的主要优点在于它简化了JavaScript的语法，特别是摒弃了容易引发错误的部分，如全局变量声明和with语句。它的设计灵感来源于Lisp，Ruby和Python等语言，这些语言的语法经过实践证明对函数式和动态编程非常友好。CoffeeScript通过提供丰富的语法糖，使代码更优雅、更易于理解。例如，它的列表推导、函数表达式和简化的类定义等特性，使得编写代码变得更加简洁。书中的内容还强调了CoffeeScript如何作为JavaScript的一个中间层，为开发者提供一个更友好的接口。它允许开发者使用ECMAScript的一些新特性，即使在浏览器尚未完全支持这些特性的情况下。这与.NET和JVM平台上的多语言支持情况相似，不同的是CoffeeScript专注于JavaScript生态。除了CoffeeScript，还有其他语言尝试在JavaScript之上构建，如Lua通过LLVM转换为JavaScript的实现。这种趋势表明JavaScript可能成为类似JVM的平台，允许各种语言在其上运行，满足不同场景的需求。尽管有人希望JavaScript成为未来唯一的编程语言，但书中认为这可能是一种不切实际的幻想。JavaScript的广泛使用和不断演进意味着它将继续作为多种工具和技术的基础，而CoffeeScript等语言则提供了在这一基础上进行创新的途径。《CoffeeScript in Action》这本书为读者提供了深入了解CoffeeScript及其如何改进JavaScript开发体验的机会，对于想要提升JavaScript编码质量和效率的开发者来说是一本宝贵的资源。

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.

www.it-ebooks.info

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'

www.it-ebooks.info

剩余431页未读，继续阅读

weixin_43162330

粉丝: 0
资源: 3

CoffeeScript：优雅提升JavaScript编程体验

coffeescript

有eco的是什么语言？

tampermonke

three.js 养小鸡游戏

vue中的js代码使用什么语言写的

Postman 如何新建脚本

pycharm语言包

最新资源