map takes a function and a collection. So, that function can be:
1. named:
- define the function on it own, using the defn macro
- pass it as first argument to map
(def coll [[1 2] [3 4] [4 5]])
(defn foo [x y]
(println x y))
(map foo coll)
2. anonymous:
- use shorthand notation #(...)
-- for one argument function, % represents the argument
-- for multiple args, use %1, %2, %3, etc., which represent arg in
specified position
- use the fn special form (fn [x y] ...)
- specify these inline in map call
(def coll [[1 2] [3 4] [4 5]])
(map #(println %1 %2) coll)
(map (fn [x y] (println x y)) coll)
On Tue, Jun 28, 2011 at 2:58 PM, octopusgrabbus <[email protected]>wrote:
> Given this sample:
>
> (ns test-csv
> (:gen-class)
> (:use clojure.contrib.command-line)
> (:use clojure-csv.core))
>
> (defn x1
> [val1 val2]
> (println val1 val2))
>
> (defn process-file
> "Process csv file and prints a column in every row"
> [file-name]
> (let [data (slurp file-name)
> rows (parse-csv data)]
> (dorun (map #(println ( nth % 11 nil)) rows))))
>
> (defn -main [& args]
> (with-command-line args
> "Get csv file name"
> [[file-name ".csv file name" "resultset.csv"]]
> [[file-name ".csv file name" 1]]
> (println "file-name:", file-name)
> (process-file file-name)))
>
> I would like to print out two or more values, or creating a vector of
> those values would be helpful. I have been experimenting, but either
> get errors or nothing printed out.
>
> I am just not sure how to approach this.
> Thanks.
> cmn
>
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