blocks|key|1738091|text|虽然javascript在某种程度上支持FP，但它并不直接鼓励它。这就是为什么像Oliver+Steele's+Functional这样的项目存在，以填补空白。所以我不推荐用它来学习FP。相反，请查看F#。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1738092|entityMap|0|LINK|mutability|MUTABLE|url|http://osteele.com/sources/javascript/functional/^0|14|Q|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Although javascript supports FP to some degree, it does not directly encourage it. That's why projects like <a href="http://osteele.com/sources/javascript/functional/" rel="nofollow noreferrer">Oliver Steele's Functional</a> exist, to fill in the gaps. So I wouldn't recommend it for learning FP. Check out F# instead.

blocks|key|1738123|text|Javascript是一种多范式语言。如果您的目标是学习函数式语言概念，请尝试从纯函数式语言开始，如OCaml或Haskell。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1738124|entityMap|0|LINK|mutability|MUTABLE|url|http://caml.inria.fr/ocaml/|1|http://www.haskell.org/^0|1E|5|0|1K|7|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Javascript is a multi-paradigm language. If your goal is to learn functional language concepts, try starting with a pure functional language like <a href="http://caml.inria.fr/ocaml/" rel="nofollow noreferrer">OCaml</a> or <a href="http://www.haskell.org/" rel="nofollow noreferrer">Haskell</a>.

blocks|key|1738171|text|我想说的是，尽管您可以通过JavaScript快速掌握一些函数式编程概念，但像使用函数式编程语言一样一致地使用JavaScript并不是一种常见的做法。至少不是很常见。大多数人不会发布关于如何使用JavaScript进行函数式编程的教程--+marxidad指出的那个例子实际上是一个相当不错的例子，但你不会发现很多这样的例子。功能方面通常并不明显，就像人们在JavaScript中使用闭包时一样，但没有意识到他们正在这样做。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1738172|将两个函数作为参数传递给第三个函数，然后让返回值成为与前两个函数相关的执行，这种想法是一种高级技术，几乎只出现在像jQuery这样的成熟库的核心中。自执行匿名函数等已经取得了进展，但仍然没有得到一致的使用。大多数教程通常关注JavaScript的面向对象功能，比如如何创建属性和方法、作用域、访问控制以及如何使用构造函数的prototype属性。老实说，如果函数式编程是你想要的，那么我会选择一种严格以这种能力著称的语言。|1738173|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I would say that although you can quickly grasp some functional programming concepts with JavaScript, using JavaScript consistently like a functional programming language is not a common practice. At least not obviously common. Most people don't post tutorials that pinpoint how to do functional programming with JavaScript -- the one marxidad pointed out is actually a pretty decent example, but you won't find a lot of that. The functional aspects are not often apparent, just like when people use closures in JavaScript, but are unaware that they are doing it.

The idea that you would pass two functions through as arguments to a third function, and then have the return value be some execution related to the first two functions is an advanced technique that almost always appears only in the core of full-blown libraries like jQuery. Self executing anonymous functions and the like have gained ground, but are still not used consistently. The majority of tutorials often focus instead on JavaScript's OO capabilities, like how to create properties and methods, scope, access control and also how to use the prototype property of constructors. Honestly, if functional programming is what you want, then I would choose a language known strictly for this capability.

blocks|key|1523160|text|还有，Eloquent+JavaScript:+Functional+Programming+chapter。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1523161|entityMap|0|LINK|mutability|MUTABLE|url|http://eloquentjavascript.net/chapter6.html^0|3|1F|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Also, <a href="http://eloquentjavascript.net/chapter6.html" rel="nofollow noreferrer">Eloquent JavaScript: Functional Programming chapter</a>.

blocks|key|1523236|text|我推荐阅读The+Little+Schemer，这是一本关于递归的非常简略的书，它很好地介绍了函数式风格。虽然它专注于方案，但它可以很容易地应用于JavaScript，请参阅http://javascript.crockford.com/little.html。我发现它在我的javascript开发中真的很有帮助，尽管它在接近尾声时变得相当棘手。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1523237|entityMap|0|LINK|mutability|MUTABLE|url|http://www.amazon.co.uk/Little-Schemer-DP-Friedman/dp/0262560992/ref=sr_1_1?ie=UTF8&s=books&qid=1222696934&sr=8-1|1|http://javascript.crockford.com/little.html^0|5|I|0|2F|17|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

I would recommend reading <a href="http://www.amazon.co.uk/Little-Schemer-DP-Friedman/dp/0262560992/ref=sr_1_1?ie=UTF8&amp;s=books&amp;qid=1222696934&amp;sr=8-1" rel="nofollow noreferrer">The Little Schemer</a>, which is a fairly slim book about recursion and is a good introduction to the functional style. Whilst it's focused on Scheme it can easily be applied to JavaScript, see <a href="http://javascript.crockford.com/little.html" rel="nofollow noreferrer">http://javascript.crockford.com/little.html</a>. I found it really helpful in my javascript development, although it gets quite tricky towards the end.

blocks|key|1738294|text|我不记得是谁说的了，但是javascript被称为“Algol语法的方案”。所以对于学习Scheme/Lisp来说，Javascript是一个不错的开始。注意，像Lisp这样的函数式语言与Haskell这样的纯函数式语言有很大的不同。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1738295|除了“一流函数”(意思是函数是值，可以赋值给变量)之外，词法作用域也是函数式语言的固有部分。|1738296|前面已经提到过Higher+Order+Javascript和The+Little+Javascripter。它们都是优秀的文本。此外，Higher+Order+Programming+in+Javascript可能是一个更容易的开始。|offset|length|1738297|entityMap|0|LINK|mutability|MUTABLE|url|http://interglacial.com/hoj/hoj.html|1|http://javascript.crockford.com/little.html|2|http://w3future.com/html/stories/hop.xml^0|0|0|7|N|0|V|N|1|1W|12|2|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$F|W|G|X|1|Y]|$F|Z|G|10|1|11]|$F|12|G|13|1|14]]|A|$]]|$1|H|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]|P|$5|K|L|M|A|$N|Q]]|R|$5|K|L|M|A|$N|S]]]]

I don't remember who said it, but javascript has been called "Scheme with Algol syntax". So for learning Scheme/Lisp, Javascript isn't a bad start. Note though that functional languages like Lisp are quite different from pure functional languages, such as Haskell.

Apart from "first-class functions" (Meaning that functions are values, that can be assigned to variables), lexical scope is also an inherent part of what makes a functional language.

<a href="http://interglacial.com/hoj/hoj.html" rel="noreferrer">Higher Order Javascript</a> and <a href="http://javascript.crockford.com/little.html" rel="noreferrer">The Little Javascripter</a> has been mentioned already. They are both excellent texts. In addition, <a href="http://w3future.com/html/stories/hop.xml" rel="noreferrer">Higher Order Programming in Javascript</a> may be an easier start.

I am looking get to grips with functional programming concepts.

I've used Javascript for many years for client side scripting in web applications and apart from using prototypes it was all simple DOM manipulation, input validation etc. 

Of late, I have <a href="http://eloquentjavascript.net/chapter6.html" rel="noreferrer">often read</a> that Javascript is one of the languages that supports functional programming.

With my familiarity and experience with Javascript, my preference is to use it to learn functional programming. I expect I would be able to concentrate more on the main functional concepts and not get bogged down or distracted by a completely new syntax.

So in summary, is Javascript a good choice to learn functional programming concepts? What capabilities in Javascript are relevant/support functional programming?

Javascript as a functional language

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我希望掌握函数式编程的概念。我多年来一直使用Javascript在web应用程序中编写客户端脚本，除了使用原型之外，它还包括简单的DOM操作、输入验证等。最近，我有说Javascript是支持函数式编程的语言之一。以我对Javascript的熟悉和经验，我更喜欢用它来学习函数式编程。我希望我能够更专注于主要的函数概念，...

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