Syntax – clojure: [] What do you do in the function parameter list?
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Java
I'm trying to solve clojure's joy and want to know_ The function of syntax in function parameter vector
Example:
(def available-processors (.availableProcessors (Runtime/getRuntime))) (prn "available processors: " available-processors) (def pool (Executors/newFixedThreadPool (+ 2 available-processors))) (defn dothreads! [func & {thread-count :threads exec-count :times :or {thread-count 1 exec-count 1}}] (dotimes [t thread-count] (.submit pool #(dotimes [_ exec-count] (func)))))
What is the form of underline?
#(dotimes [_ exec-count] (func))
Solution
I believe that by convention, clojure uses underscores as placeholders for required but unused parameters As Keith Bennet said:
Your example is consistent with this "use" because you do not need to use the first parameter of dotime as an indexer, but the form needs to be bound
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