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Asked: 2026-05-13T18:39:57+00:00

It seems as though I’m having problems accessing Integer.parseInt in comp. I can access

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It seems as though I’m having problems accessing Integer.parseInt in comp. I can access it normally like this:

user=> (Integer/parseInt "123")
123

But if I put it in comp, I get an error:

user=> (def vect-to-int (comp Integer/parseInt (partial apply str)))
java.lang.Exception: Unable to find static field: parseInt in class java.lang.Integer (NO_SOURCE_FILE:3)

It sounds to me like it’s trying to find a field on Integer when it should be looking for a method. How can I use Integer.parseInt like this? And is there a better way to convert a vector of chars into an int?

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1 Answer

  1. Editorial Team

    Clojure functions are java methods but java methods are not clojure functions For instance Clojure functions have meta-data and such. If you want to use a java method where a Clojure function is called for then you have two choices in wrapping it up, memfn and fun or #( ) memfn is an obsolete function that wrapped up a java method in a clojure function (its good to know it exists even if its not used often). The generally accepted way to wrap up java methods is:

    #(. instance method arg1 argN)

    or for static methods

    #(Class/MethodName arg1 argN)
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