The corresponding lowercase letter, if c is an uppercase ASCII character, otherwise c itself.
1 assert(toLower('a') == 'a'); 2 assert(toLower('A') == 'a'); 3 assert(toLower('#') == '#'); 4 5 // N.B.: Non-ASCII Unicode uppercase letters are not converted. 6 assert(toLower('Á') == 'Á');
Converts an ASCII letter to lowercase.