I have this definition for a procedure:
(define type-of (lambda (item)
(cond
[(pair? item) 'pair]
[(null? item) 'empty-list]
[(number? item) 'number]
[(symbol? item) 'symbol]
[else 'some-other-type])))
My understanding is that if the first 4 conditions fail (=> #f
<https://plus.google.com/s/%23f/posts>), then the last expression (the else
expression) is evaluated.
When I apply this procedure to John, as in (type-of John) I get an error
(; john: undefined; ; cannot reference an identifier before its definition)
.
What is going on?
Thanks
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