自从我去年开始学习f#和OCaml以来，我已经阅读了大量的文章，这些文章坚持认为设计模式(尤其是Java中的)是命令式语言中缺失特性的变通方法。我发现的一篇文章给出了相当有力的主张:
Most people I've met have read
the Design Patterns book by the Gang of
Four (GoF). Any self respecting programmer
will tell you that the book is
language agnostic and the patterns
apply to software engineering in
general, regardless of which language
you use. This is a noble claim.
Unfortunately it is far removed from
the truth.
Functional languages are extremely
expressive. In a functional language
one does not need design patterns
because the language is likely so high
level, you end up programming in
concepts that eliminate design
patterns all together.
函数式编程(FP)的主要特性包括函数作为一类值、curry化、不可变值等。在我看来，OO设计模式是否接近这些特性并不明显。
此外，在支持OOP的函数式语言(如f#和OCaml)中，使用这些语言的程序员显然会使用与其他OOP语言相同的设计模式。事实上，现在我每天都在使用f#和OCaml，我在这些语言中使用的模式与我在Java中使用的模式之间没有明显的区别。
函数式编程消除了对面向对象设计模式的需求这一说法是否属实?如果是这样的话，你能发布或链接到一个典型的OOP设计模式的例子及其功能对等物吗?
布莱恩关于语言和模式之间紧密联系的评论很中肯，
The missing part of this discussion is the concept of idiom. James O. Coplien's book, "Advanced C++" was a huge influence here. Long before he discovered Christopher Alexander and the Column Without a Name (and you can't talk sensibly about patterns without reading Alexander either), he talked about the importance of mastering idioms in truly learning a language. He used string copy in C as an example, while(*from++ = *to++); You can see this as a bandaid for a missing language feature (or library feature), but what really matters about it is that it's a larger unit of thought, or of expression, than any of its parts.
这就是模式和语言试图做的，让我们更简洁地表达我们的意图。思想的单位越丰富，你能表达的思想就越复杂。从系统架构到琐碎小事，在不同的范围内拥有丰富的、共享的词汇，可以让我们进行更明智的对话，并思考我们应该做什么。
作为个体，我们也可以学习。这就是练习的意义所在。我们每个人都能理解和使用我们自己永远无法想到的东西。语言、框架、库、模式、习语等等都在共享知识财富中占有一席之地。
布莱恩关于语言和模式之间紧密联系的评论很中肯，
The missing part of this discussion is the concept of idiom. James O. Coplien's book, "Advanced C++" was a huge influence here. Long before he discovered Christopher Alexander and the Column Without a Name (and you can't talk sensibly about patterns without reading Alexander either), he talked about the importance of mastering idioms in truly learning a language. He used string copy in C as an example, while(*from++ = *to++); You can see this as a bandaid for a missing language feature (or library feature), but what really matters about it is that it's a larger unit of thought, or of expression, than any of its parts.
这就是模式和语言试图做的，让我们更简洁地表达我们的意图。思想的单位越丰富，你能表达的思想就越复杂。从系统架构到琐碎小事，在不同的范围内拥有丰富的、共享的词汇，可以让我们进行更明智的对话，并思考我们应该做什么。
作为个体，我们也可以学习。这就是练习的意义所在。我们每个人都能理解和使用我们自己永远无法想到的东西。语言、框架、库、模式、习语等等都在共享知识财富中占有一席之地。
