JavaScript Allongé 第六版：从函数到类的编程探索

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"javascript allonge 6th edition" JavaScript Allongé 第六版是一本深入探讨JavaScript编程的书籍，特别是从函数式编程的角度出发，逐渐引入面向类的编程概念。作者Reg Braithwaite是一位知名的程序员，他在2015年至2016年间完成了这本书的创作，并在Leanpub平台上发布。Leanpub是一个支持作者使用轻量级工具进行迭代出版的平台，鼓励通过获取读者反馈来不断优化作品。本书主要关注JavaScript的核心特性，特别是如何利用其函数式编程特性进行高效开发。书中强调了JavaScript中的值和表达式，这是理解任何编程语言基础的关键。"valuesareexpressions"这一章节指出，在JavaScript中，值是表达式的结果，这允许我们构建出更复杂的计算逻辑。此外，"valuesandidentity"部分探讨了值的等价性和标识性，这对于理解引用类型和基本类型的差异至关重要。 JavaScript Allongé 不仅关注函数式编程，还逐步引导读者理解如何在JavaScript（ECMAScript标准）中过渡到面向类的编程。随着JavaScript的发展，它引入了类和模块等新特性，使得开发者能够以更传统的方式来组织代码。第六版可能涵盖了这些新特性的使用和最佳实践。此外，书中的"Foreword"和"Prelude"部分提供了对整个作品的背景介绍和初步理解，帮助读者建立正确的阅读视角。"A Rich Aroma"暗示了书中将深入讨论JavaScript的精妙之处，就像品味一杯丰富的咖啡，需要细细品味和理解。 JavaScript Allongé 第六版是一本适合有经验的JavaScript开发者深入学习和提升技能的书籍，它通过丰富的实例和深入的理论，让读者更全面地理解和应用JavaScript的函数式编程和面向类编程的特性。

A Pull of the Lever: Prefaces xi

About The Sample PDF

This sample edition of the book includes just a portion of the complete book. Buying the book in

progress entitles you to free updates, so download it today⁷! Besides, there’s really no risk at all. If

you read JavaScript Allongé, The “six” edition and it doesn’t blow your mind, your money will be

cheerfully refunded.

–Reginald “Raganwald” Braithwaite, Toronto, 2015

⁷http://leanpub.com/javascriptallongesix

Prelude: Values and Expressions over Coffee xiv

values are expressions

All values are expressions. Say you hand the barista a café Cubano. Yup, you hand over a cup with

some coffee infused through partially caramelized sugar. You say, “I want one of these.” The barista

is no fool, she gives it straight back to you, and you get exactly what you want. Thus, a café Cubano

is an expression (you can use it to place an order) and a value (you get it back from the barista).

Let’s try this with something the computer understands easily:

Is this an expression? A value? Neither? Or both?

The answer is, this is both an expression and a value.¹⁰ The way you can tell that it’s both is very

easy: When you type it into JavaScript, you get the same thing back, just like our café Cubano:

//=> 42

All values are expressions. That’s easy! Are there any other kinds of expressions? Sure! let’s go back

to the coffee shop. Instead of handing over the finished coffee, we can hand over the ingredients.

Let’s hand over some ground coffee plus some boiling water.

Astute readers will realize we’re omitting something. Congratulations! Take a sip of espresso. We’ll

get to that in a moment.

Now the barista gives us back an espresso. And if we hand over the espresso, we get the espresso

right back. So, boiling water plus ground coffee is an expression, but it isn’t a value.¹¹ Boiling water

is a value. Ground coffee is a value. Espresso is a value. Boiling water plus ground coffee is an

expression.

Let’s try this as well with something else the computer understands easily:

"JavaScript" + " " + "Allonge"

//=> "JavaScript Allonge"

¹⁰Technically, it’s a representation of a value using Base10 notation, but we needn’t worry about that in this book. You and I both understand that

this means “42,” and so does the computer.

¹¹In some languages, expressions are a kind of value unto themselves and can be manipulated. The grandfather of such languages is Lisp. JavaScript

is not such a language, expressions in and of themselves are not values.

剩余296页未读，继续阅读

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