Problem 99 bugs?

[Jordan Thevenow-Harrison]

My solution for problem 99 gets rejected as having failed the tests, but passes them in my repl:

#(vec (map int (str (* %1 %2))))

Am I doing something wrong, or is there some incompatibility between 4clojure and this solution?

[Alexey Perekhodov]

On my repl it fails also. The reason is that you try to convert symbol to int and so you get the char code of the symbol.

>(str (* 1 1))
=> "1"
>(map int "1")
=> (49)   
>(first "1")
=> \1

[Jordan Thevenow-Harrison]

Ah, I see. I was basing my evaluation in Replete, using ClojureScript, which was returning strings. I got it to work on 4Clojure with

(fn [x y] (vec (map #(. Integer parseInt (. String valueOf %)) (str (* x y)))))

Which is not elegant but works. Thanks for the heads up!

[Alexey Perekhodov]

You still can make your solution look more elegant.

First, 'vec' is unnecessary -- you can provide sequence as a final result.

Then, since Clojure string is Java string, instead of (. String valueOf %) you can just write (str %).

Another way is to even avoid Java interop. Since (int \0) equals 48,

you can use 'int' conversion as in your original solution and then subtract 48.

[Alexey Perekhodov]

And one more note.

Since java Integer constructur can take string as an argument you can do:

 

   >(Integer. "1")
   => 1