The 'char' function returns the ASCII numeric value of the character at the specified 'position' in the 'string'. A position of '0' is the first character in the string.
(char "12345" 0) ; returns #\1 (char "12 45" 2) ; returns #\Space (string (char "1234" 3)) ; returns "4" (char "1234" 9) ; error: index out of range
See the
char
function in the