在Clojure中的广义线程宏 [英] Generalized Threading Macro in Clojure

问题描述

注意：这不是关于并发。这是关于线程宏。

Note: this is NOT about concurrency. This is about the thread macro.

我知道 - > 将对象放在第二个位置， code> - >> 将参数放在最后一个位置。

I know that -> puts the object at the 2nd position and ->> puts the argument at the last position.

现在，我很好奇，函数的＃（...％）的短手符号，是否有一个简短的符号，让我把参数放在任意位置？

Now, I'm curious, much like the short hand notation of #( ... % ) for functions, is there a short hand notation for threads that lets me place the argument at arbitrary location?

目标是，而不是让线程运行的固定位置...我可以写任意形式，并在特殊位置插入%% ，并且%%是线程插入的位置。

The goal would be that instead of having a fixed location for the thread to run through ... I can write arbitrary forms, and insert %% at special places, and the %% is where the thread gets inserted.

谢谢！

推荐答案

Swiss Arrows 图书馆的钻石棒可以满足您的要求：

The 'diamond wand' from Swiss Arrows library would do what you're asking for:

(-<> 0
 (* <> 5)
 (vector 1 2 <> 3 4))
; => [1 2 0 3 4]

也就是说，这不是你最终需要的东西或 ）

That said, it isn't something you end up needing often (or ever in my Clojure experience)

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