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char string index ⇒ character
schar string index ⇒ character
(setf (char string index) new-character)
(setf (schar string index) new-character)
string—for char, a string; for schar, a simple string.
index—a valid array index for the string.
character, new-character—a character.
char and schar access the element of string specified by index.
char ignores fill pointers when accessing elements.
(setq my-simple-string (make-string 6 :initial-element #\A)) ⇒ "AAAAAA"
(schar my-simple-string 4) ⇒ #\A
(setf (schar my-simple-string 4) #\B) ⇒ #\B
my-simple-string ⇒ "AAAABA"
(setq my-filled-string
(make-array 6 :element-type 'character
:fill-pointer 5
:initial-contents my-simple-string))
⇒ "AAAAB"
(char my-filled-string 4) ⇒ #\B
(char my-filled-string 5) ⇒ #\A
(setf (char my-filled-string 3) #\C) ⇒ #\C
(setf (char my-filled-string 5) #\D) ⇒ #\D
(setf (fill-pointer my-filled-string) 6) ⇒ 6
my-filled-string ⇒ "AAACBD"
(char s j) ≡ (aref (the string s) j)