Hi All,
I wrote a piece of code to count the occurrance of a letter in a list. But
it gave me an error saying "#<procedure:...uments..."
The code is below:
(define (count-matches s l)
(cond
[(empty? l) 0]
[(equal? s (first l)) (lambda (i)(+ i 1))]
[else (count-matches s (rest l))]))
Where the s is a letter and l is a list. To use it as an example, I typed
(count-matches 'f '(f ))
and got the error. The right result should be 1.
Do I need to initialize i? If so, how can I do it?
Note that the keywords that I can use are pretty much used in the code. If
the solution needs keywords outside this post, it may not be useful to me.
Thank you very much.
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