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S9 LIB (string-map procedure^1 string ...) ==> string
(string-map! procedure^1 string ...) ==> unspecific
(load-from-library "string-map.scm")
Map a procedure over a string, giving a new string
(string (f (string-ref s i)) ...)
where F is the given PROCEDURE and S is the string to map.
STRING-MAP is to strings what MAP is to lists.
STRING-MAP! does not create a fresh string, but changes the
given one in situ.
(string-map char-downcase "HELLO") ==> "hello"
(let ((s (string-copy "HELLO!")))
(string-map! char-downcase s)
s) ==> "hello!"
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