Hi,
I am trying to write a function to return a boolean as to whether
parenthesis are balanced or not?
(defn bal-parens? [parens]
(let [replaced (clojure.string/replace parens "()" "")
checked (re-seq #"\(\)" replaced)]
(println checked)
(if-not (nil? checked) (bal-parens? replaced))
(println (str "replaced is " replaced))
(if (empty? replaced) true false)))
(bal-parens? "(()())")
I'd expect to see true here.
But my output is:
(())
nil
replaced is
replaced is ()
false
I can't for the life of me think why, that when checked is nil and replaced
is empty the function doesn't terminate!
Many Thanks
Aidy
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