Help with decisions in threading macros

[Timur]

Hi all,

Often I need to make decisions in simple threading macros, for instance consider the following code

(->> m
       :vector
       (filterv #(= (:id %) (:id m)))
       (reduce #(and %1 %2)))

In this case, if the result of filter is empty reduce throws an exception as it expects some values. Therefore, I want to include a decision between filter and reduce for instance if empty then add false into the resulting vector. What would be the best way to achieve this? I could add a function that checks if empty then add sth into the vector but wanted to ask your opinions if there is a better way to do this.

Regards,

Timur

[Atamert Ölçgen]

Perhaps you can replace (reduce ...) with (every? true?), which works with empty collections.

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Kind Regards,
Atamert Ölçgen

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www.muhuk.com

[Erik Assum]

some->> 

Erik. 

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i farta

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[Timur Sungur]

Thanks!!

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[Oliver Hine]

See also cond-> (Clojure core) and even condas-> (http://blog.juxt.pro/posts/condas.html)

Oliy