StringControlCase - Cookbook - s c h e m a t i c s : c o o k b o o k

Controlling Case

Problem

You need to convert a string to all uppercase or all lowercase.

Solution

Use string-upcase or string-downcase from SRFI 13.

(require (lib "13.ss" "srfi"))

(string-upcase "hello")
>"HELLO"
(string-downcase "SCHEME")
>"scheme"

SRFI 13 provides a number of case conversion functions. In addition to string-upcase and string-downcase there are string-upcase! and string-downcase!, which modify the input string in-place, and string-titlecase which capitalises the first letter of each word and makes all others lowercase:

(string-titlecase "--capitalize tHIS sentence.")
>"--Capitalize This Sentence."

Furthermore, the string.ss library in MzLib? contains functions string-uppercase! and string-lowercase! that are equivalent to the SRFI 13 functions string-upcase! and string-downcase!

-- GordonWeakliem - 19 Apr 2004

-- NoelWelsh - 20 Apr 2004

CookbookForm
TopicType:	Recipe
ParentTopic:	StringRecipes
TopicOrder:	090

Current Rev: r1.6 - 09 Jun 2004 - 15:42 GMT - NoelWelsh, Revision History:Diffs | r1.6 | > | r1.5 | > | r1.4

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s c h e m a t i c s : c o o k b o o k

Controlling Case

Problem

Solution

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