Check if s has proper noun capitalization.
That is, s starts with a capital letter followed by only lower letters.
assert(!``.isCapitalized); assert(!`alpha`.isCapitalized); assert(!`ALPHA`.isCapitalized); assert(!`aThing`.isCapitalized); assert(`Alpha`.isCapitalized); assert(!`Jack London`.isCapitalized);
See Implementation
Check if s has proper noun capitalization.
That is, s starts with a capital letter followed by only lower letters.