Convert to lowercase or uppercase

s.lcase([ss])
s.ucase([ss])

s.lcase(from [length])
s.ucase(from [length])

s - str variable.

ss - a string to assign to s before converting.

from, len (QM 2.3.5) - range of characters (bytes).

If len omitted or -1, converts all starting from from.
If the range ends in a middle of a multibyte UTF-8 character, includes whole character.

lcase converts to lowercase.

ucase converts to uppercase.

str s1 = "String"
s1.ucase
out s1 ;;STRING

str s2 = "sTrInG"
s2.ucase(0 1)
s2.lcase(1)
out s2 ;;String