CODEWITHSUNDEEP
clojure
Jeremiah Trahern
Jeremiah Trahern

Reputation: 15

Beginner in Clojure: trying to apply function to items in list

So I've got this list returned from calling lines:

(def lines  (into () (clojure.string/split-lines (slurp "input.txt"))))

And I've got these two functions:

(defn tokenize-line [x] (clojure.string/split x #" " ))

(defn tokenize-list  [lst] (for [x lst] (tokenize-line [x])))

When I pass (lines) as a parameter to tokenize-list, I get this error:

ClassCastException clojure.lang.PersistentList cannot be cast to clojure.lang.IFn

I can't figure out where this error comes from, any help would be amazing!

Upvotes: 0

Views: 79

Answers (1)

noisesmith
noisesmith

Reputation: 20194

In clojure (lines) means "call the function lines with no arguments". As we see from your definition, lines is not a function, it's a list.

Also, in (tokenize-line [x]) you pass a vector, containing the String x, to a function that expects a String.

Further, when you run (into () ...) this takes something that was already a sequence, and turns it into a reversed sequence (because of the behavior of () when you add elements, they end up in reversed order).

Upvotes: 2

Related Questions