1.28.12 Character: testing

isAlphaNumeric

True if self is a letter or a digit

isDigit

True if self is a 0-9 digit

isDigit: radix

Answer whether the receiver is a valid character in the given radix.

isLetter

True if self is an upper- or lowercase letter

isLowercase

True if self is a lowercase letter

isPathSeparator

Returns true if self is a path separator ($/ or $\ under Windows, $/ only under Unix systems including Mac OS X).

isPunctuation

Returns true if self is one of '.,:;!?'

isSeparator

Returns true if self is a space, cr, tab, nl, or newPage

isUppercase

True if self is uppercase

isVowel

Returns true if self is a, e, i, o, or u; case insensitive