toLowerCase method Null safety
Converts all characters in this string to lower case.
If the string is already in all lower case, this method returns this.
'ALPHABET'.toLowerCase(); // 'alphabet'
'abc'.toLowerCase(); // 'abc'
This function uses the language independent Unicode mapping and thus only works in some languages.
Implementation
// TODO(floitsch): document better. (See EcmaScript for description).
String toLowerCase();