string-downcase

[procedure] string-upcase s [start end]

[procedure] string-downcase s [start end]

SRFI-13

See also string-upcase!, string-titlecase

Some implementations call these string-upper and string-lower.

[procedure] string-upcase s

[procedure] string-downcase s

Chicken, Guile, Bigloo:

 doesn't take optional arguments.

See also string-capitalize