Returns the documentation string of proc if it exists, or
If the body of a
lambda(or the definition of a procedure) has more than one expression, and the first expression (preceeding any internal definitions) is a string, then that string is the documentation string of that procedure.(procedure-documentation (lambda (x) "Identity" x)) ⇒ "Identity" (define (square x) "Return the square of X." (* x x)) ⇒ #<unspecified> (procedure-documentation square) ⇒ "Return the square of X."
Returns the (appended) strings given as arguments to previous calls
commentand empties the current string collection.