CODEWITHSUNDEEP
clojurereadline
Suhyeon CHOI
Suhyeon CHOI

Reputation: 55

Clojure doesn't work the way I want it to

I made a function to take questions like this.

(defn ask-ques [ques pred]
  (print ques)
  (let [user-input (read-line)]
    (if #(pred user-input) user-input (recur ques pred))))

And I wrote main like this.

(defn -main []
  (loop []
      (let [user-input (ask-ques "CHOOSE ONE. (C)ontinue OR (E)xit : " #(contains? #{"C" "E"} %))]
        (when (= user-input "C") (apply body (rand-nth (seq voc-map))) (recur)))))

But, Clojure received the input first and printed "CHOOSE ONE. (C)ontinue OR (E)xit : " out, and pred does not work well.

What's the problem? Why does it work like this? And what should I do?

Upvotes: 1

Views: 104

Answers (1)

Sean Corfield
Sean Corfield

Reputation: 6666

#(pred user-input) is a function of zero arguments and, since it has a non-nil value, the if will treat it as truth, so you will always get user-input and it will never recur. I suspect you want (pred user-input) instead.

Upvotes: 2

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