You wanted a banana but you got a gorilla holding the banana

最新推荐文章于 2024-06-26 10:32:58 发布

hlzhao369

最新推荐文章于 2024-06-26 10:32:58 发布

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分类专栏： Software engineering 文章标签： OO Language Function Code Reusability

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Joe Armstrong，Erlang语言的创造者，指出在面向对象语言中缺乏可重用性的问题，而函数式语言如Erlang则因其函数的纯度和无状态特性，使得代码易于重用。

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Joe Armstrong, creator of Erlang, on software reusability.

I think the lack of reusability comes in object-oriented languages, not functional languages. Because the problem with object-oriented languages is they’ve got all this implicit environment that they carry around with them. You wanted a banana but what you got was a gorilla holding the banana and the entire jungle.

If you have referentially transparent code, if you have pure functions — all the data comes in its input arguments and everything goes out and leave no state behind — it’s incredibly reusable.

Source: Coders at Work. Emphasis added.

I do most of my work in object-oriented languages and I don’t see that changing any time soon. I’m more interested in functional techniques than functional languages : using pure functions, using functions as arguments and return values, etc. As Joe Armstrong says, such code is easier to reuse. If you want to reuse (or test) a functional banana, you don’t have to set up a stateful gorilla to hold the banana first.

From : http://www.johndcook.com/blog/2011/07/19/you-wanted-banana/