chickadee » scheme » base » string-map

It is an error if proc does not accept as many arguments as there are strings and return a single character.

The string-map procedure applies proc element-wise to the elements of the strings and returns a string of the results, in order. If more than one string is given and not all strings have the same length, string-map terminates when the shortest string runs out. The dynamic order in which proc is applied to the elements of the strings is unspecified. If multiple returns occur from string-map, the values returned by earlier returns are not mutated.

(string-map char-foldcase "AbdEgH") ==> "abdegh"

(string-map
 (lambda (c)
   (integer->char (+ 1 (char->integer c))))
 "HAL")                ==> "IBM"

(string-map
 (lambda (c k)
   ((if (eqv? k #\u) char-upcase char-downcase)
    c))
 "studlycaps xxx"
 "ululululul")         ==> "StUdLyCaPs"