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jso this? added by mario-goulart on Tue Feb 7 20:44:37 2012

(use jso)

(define o (make-jso))

(jso-set! o 'counter 0)

(jso-set! o 'add (lambda (n)
		   (jso-set! o 'counter (+ (jso-ref o 'counter) n))))

((jso-ref o 'add) 3)
((jso-ref o 'add) 4)

(pp (jso-ref o 'counter))
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Which procedure can be used to check whether its argument is a procedure?
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