大文字と小文字の変換

code:jl

str = "HELLO world"

uppercase(str) # "HELLO WORLD"

lowercase(str) # "hello world"

32ビット目の値を反転させる

code:jl

function switch_lower_upper_ascii(char::Char)::Char

if 'A' <= char <= 'z'

return Char(UInt8(char) ⊻ 0b0010_0000)

else

return char

end

end

switch_lower_upper_ascii('F') # 'f': ASCII/Unicode U+0066 (category Ll: Letter, lowercase)

switch_lower_upper_ascii('f') # 'F': ASCII/Unicode U+0046 (category Lu: Letter, uppercase)