Blank

Testing for blank

A blank String is a String that is meets at least one of the following criteria:

• null

• zero length

• only contains whitespace

isBlank

 String isBlank(String? string)

The isBlank returns true if ANY ONE of the above criteria holds true

String.isBlank(null);
-> true
String.isBlank('');
-> true
String.isBlank('\t\n\r ');
-> true
String.isBlank('a');
-> false

isNotBlank

 String isNotBlank(String? string)

The isNotBlank returns true only if ALL of the above criteria are invalid

String.isNotBlank(null);
-> false
String.isNotBlank('');
-> false
String.isNotBlank('\t\n\r ');
-> flase
String.isNotBlank('a');
-> true