Exception : cannot create ISeq from Long when empty list is present.. ?

[Ashish Negi]

I am writing a soduku solver.. Everything works but since i am interested in first solution.. when i write `first` after https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L58

I get

{:type java.lang.IllegalArgumentException

;; :message "Don't know how to create ISeq from: java.lang.Long"

;; :at [clojure.lang.RT seqFrom "RT.java" 542]}

though printing the argument gives me..
    ; "value: " () " class: " clojure.lang.LazySeq

at https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L786

Please see full stack trace at : https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L88

[Ashish Negi]

the code throwing exceptions is below it : https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L76

[James Reeves]

"solve" is a recursive function that expects a collection of mazes to be returned. By adding "first" you change the return type, stripping off a layer each recursive call until you get integers instead of vectors.

- James

On 24 July 2016 at 08:32, Ashish Negi <thisismy...@gmail.com> wrote:

the code throwing exceptions is below it : https://github.com/ashishnegi/joy-of-clojure/blob/master/src/joy_of_clojure/chap16_thinking_programs.clj#L76

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[Ashish Negi]

Thanks James..

I will now add a vector after first..